Star Wars Celebration Day kicked off with the release of an extended teaser for Ahsoka, the latest interconnected series in the Star Wars franchise set to debut this summer on Disney+. Written by Dave Filoni, the series stars Rosario Dawson in the title role.

The Jedi Padawan of Anakin Skywalker, Ahsoka was first introduced as a supporting character in 2008's animated film Star Wars: The Clone Wars and the subsequent animated series. The character returned in the sequel series Star Wars Rebels (2014-2018) as a member of the Rebel Alliance, operating under the codename Fulcrum, and made numerous other cameo appearances in the extended Star Wars universe. Dawson's live-action version made her debut in The Mandalorian's second season. We last saw Ahsoka briefly in The Book of Boba Fett, when she passed on a gift of chain mail to Grogu after warning Mando/Din Djarin that his presence would be a distraction from Grogu's Jedi training. We all know how that turned out: Din and Grogu reunited and went on to share even more adventures in The Mandalorian S3, which will wrap later this month.

The official premise for Ahsoka is short and sweet: "Set after the fall of the Empire, Ahsoka follows the former Jedi knight Ahsoka Tano as she investigates an emerging threat to a vulnerable galaxy." In addition to Dawson, the cast includes Natasha Liu Bordizzo as Sabine Wren, a young Mandalorian warrior, graffiti artist, and former bounty hunter; Mary Elizabeth Winstead as Hera Syndulla, a former pilot for the Rebellion; Eman Esfandi as Ezra Bridger, a former con artist and thief who trained as a Jedi; and Ray Stevenson as Baylan.

Enlarge / Archaeologists have discovered the first physical evidence of the so-called "gold of honor" ceremony in Ancient Egypt, in which the severed hands of defeated foes were presented to the Pharaoh in exchange for a collar of golden beads. (credit: J. Gresky et al., 2023/CC BY 4.0)

There is evidence that ancient Egyptian soldiers would sever the right hands of foes and present them to the Pharaoh. That evidence comes in the form of tomb inscriptions of prominent warriors, as well as inscriptions and iconography on temple reliefs. Archaeologists have now discovered the first physical evidence of such a trophy-taking practice, according to a recent paper published in the journal Scientific Reports. The severed right hands of 12 individuals were excavated from pits within a courtyard of a 15th Dynasty palace in northeastern Egypt.

The 15th Dynasty (circa 1640-1530 BCE) rulers were known as Hyksos ("rulers of foreign lands"), although they did not control all of Egypt from their seat of power in the city of Avaris—the pharaohs of the 16th and 17th Dynasties ruled from Thebes during the same time period. Historians disagree about whether the Hyksos came to Egypt as invaders or gradually settled in the Nile Delta before rising to power. But by the late 17th Dynasty, the Hyksos and the pharaohs were at war, leading to the former's defeat by Ahmose I, who founded the 18th Dynasty.

But the Hyksos nonetheless left their mark on Egyptian culture in the form of certain technological advances and customs, including the practice of presenting the severed right hands of defeated foes in a so-called "gold of honor" ceremony in exchange for a collar of golden beads. Per the authors, the Egyptians seem to have adopted the custom during Ahmose I's reign at the latest, based on a relief showing a pile of hands in his temple in Abydos. Tomb inscriptions and temple reliefs from the 18th to the 20th Dynasties "consistently depict hand counts on the battlefield following major battles," the authors wrote. However, there was no physical evidence of the custom beyond iconographic and literary sources—until now.

Enlarge / Event display of a W-boson candidate decaying into a muon and a muon neutrino inside the ATLAS experiment. The blue line shows the reconstructed track of the muon, and the red arrow denotes the energy of the undetected muon neutrino. (credit: ATLAS Collaboration/CERN)

It's often said in science that extraordinary claims require extraordinary evidence. Recent measurements of the mass of the elementary particle known as the W boson provide a useful case study as to why. Last year, Fermilab physicists caused a stir when they reported a W boson mass measurement that deviated rather significantly from theoretical predictions of the so-called Standard Model of Particle Physics—a tantalizing hint of new physics. Others advised caution, since the measurement contradicted prior measurements.

That caution appears to have been warranted. The ATLAS collaboration at CERN's Large Hadron Collider (LHC) has announced a new, improved analysis of their own W boson data and found the measured value for its mass was still consistent with Standard Model. Caveat: It's a preliminary result. But it lessens the likelihood of Fermilab's 2022 measurement being correct.

"The W mass measurement is among the most challenging precision measurements performed at hadron colliders," said ATLAS spokesperson Andreas Hoecker. "It requires extremely accurate calibration of the measured particle energies and momenta, and a careful assessment and excellent control of modeling uncertainties. This updated result from ATLAS provides a stringent test, and confirms the consistency of our theoretical understanding of electroweak interactions.”

Yellowstone National Park is most famous for Old Faithful, a geyser with fairly predictable periodic eruptions that delight visiting tourists. But it's also home to many other geothermal features like Doublet Pool, a pair of hot springs connected by a small neck with the geothermic equivalent of a pulse. The pool "thumps" every 20-30 minutes, causing the water to vibrate and the ground to shake. Researchers at the University of Utah have measured those thumping cycles with seismometers to learn more about how they change over time. Among other findings, they discovered that the intervals of silence between thumps correlate with how much heat is flowing into the pool, according to a new paper published in the journal Geophysical Research Letters.

“We knew Doublet Pool thumps every 20-30 minutes,” said co-author Fan-Chi Lin, a geophysicist at the University of Utah. “But there was not much previous knowledge on what controls the variation. In fact, I don’t think many people actually realize the thumping interval varies. People pay more attention to geysers.”

Yellowstone's elaborate hydrothermal system is the result of shallow groundwater interacting with heat from a hot magma chamber. The system boasts some 10,000 geothermal features, including steam vents (fumaroles), mud pots, and travertine terraces (chalky white rock), as well as geysers and hot springs.

In 1894, a schooner barge called Ironton collided with a Great Lakes freighter called Ohio in Lake Huron's infamous "Shipwreck Alley." Ohio's wreck was found in 2017 by an expedition organized by the National Oceanic and Atmospheric Administration's (NOAA) Thunder Bay National Marine Sanctuary. Now the same team has announced its discovery of the wreck of the 191-foot Ironton nearly 130 years after its sinking, so well-preserved in the frigid waters of the Great Lakes that its three masts are still standing, and its rigging is still attached. Its discovery could help resolve unanswered questions about the ship's final hours.

Schooner barges like Ironton were part of a fleet that helped transport wheat, coal, corn, lumber, and iron ore across the Great Lakes region, towed by steamers. At 12:30 am on September 26, 1984, Ironton and another schooner, Moonlight, were being towed unladen across Lake Huron by the steamer Charles J. Kershaw when the steamer's engine failed. The weather was rough, and strong winds pushed the two schooners perilously close to the disabled steamer. Fearing a collision, Moonlight's crew cut Ironton's tow line, setting Ironton adrift.

Captain Peter Girard and his crew tried to regain control of the ship, but the wind blew them onto a head-on collision course with the Ohio, which was carrying 1,000 tons of grain. According to the account of surviving crew member William Wooley, it was too dark to spot the Ohio until it was too late, and Ironton struck the steamer with its starboard bow, tearing a 12-foot wide hole in Ohio's hull.

Enlarge / The tattered shell of the first recorded supernova (SN185) was captured by the Dark Energy Camera. This image covers an impressive 45 arcminutes in the sky—a rare view of the entirety of this supernova remnant. (credit: CTIO/NOIRLab/DOE/NSF)

In early December 185 CE, Chinese astronomers recorded a bright "guest star" in the night sky that shone for eight months in the direction of Alpha Centauri before fading away—most likely the earliest recorded supernova in the historical record. The image above gives us a rare glimpse of the entire tattered remnant of that long-ago explosion, as captured by the Dark Energy Camera (DECam), mounted on the 4-meter telescope at the Cerro Tololo Inter-American Observatory in the Andes in Chile. DECam has been operating since 2012, and while it was originally designed to be part of the ongoing Dark Energy Survey, it's also available for other astronomers to use in their research. This new wide-view perspective of the remains of SN185 should help astronomers learn even more about stellar evolution.

As we've written previously, there are two types of known supernovas, depending on the mass of the original star. An iron-core collapse supernova occurs with massive stars (greater than 10 solar masses), which collapse so violently that it causes a huge, catastrophic explosion. The temperatures and pressures become so high that the carbon in the star's core fuses. This halts the core's collapse, at least temporarily, and this process continues, over and over, with progressively heavier atomic nuclei. When the fuel finally runs out entirely, the (by then) iron core collapses into a black hole or a neutron star.

Then there is a Type Ia supernova. Smaller stars (up to about eight solar masses) gradually cool to become dense cores of ash known as white dwarfs. If a white dwarf that has run out of nuclear fuel is part of a binary system, it can siphon off matter from its partner, adding to its mass until its core reaches high enough temperatures for carbon fusion to occur. These are the brightest supernovae, and they also shine with a remarkably consistent peak luminosity, making them invaluable "standard candles" for astronomers to determine cosmic distances.

Enlarge / Map of the known corridors and rooms inside the Great Pyramid of Giza. Evidence of a secret corridor was detected in 2016 behind the famed chevron blocks on the north face (h). Another mysterious large void (i) was discovered in 2017—a possible hidden chamber. (credit: Procureur et al., 2023)

In 2016, scientists using muon imaging picked up signals indicating a hidden corridor behind the famous chevron blocks on the north face of the Great Pyramid of Giza in Egypt. The following year, the same team detected a mysterious void in another area of the pyramid, believing it could be a hidden chamber. Two independent teams of researchers, using two different muon imaging methods, have now successfully mapped out the corridor for the first time, according to a new paper published in the journal Nature Communications. Zahi Hawass, Egypt’s former antiquities minister, called it "the most important discovery of the 21st century."

As we've reported previously, there is a long history of using muons to image archaeological structures, a process made easier because cosmic rays provide a steady supply of these particles. An engineer named E.P. George used them to make measurements of an Australian tunnel in the 1950s. But Nobel-prize-winning physicist Luis Alvarez really put muon imaging on the map when he teamed up with Egyptian archaeologists to use the technique to search for hidden chambers in the Pyramid of Khafre at Giza. Although it worked in principle, they didn't find any hidden chambers.

There are many variations of muon imaging, but they all typically involve gas-filled chambers. As muons zip through the gas, they collide with the gas particles and emit a telltale flash of light, which is recorded by the detector, allowing scientists to calculate the particle's energy and trajectory. It's similar to X-ray imaging or ground-penetrating radar, except with naturally occurring high-energy muons rather than X-rays or radio waves. That higher energy makes it possible to image thick, dense substances like the stones used to build pyramids. The denser the imaged object, the more muons are blocked, casting a telltale shadow. Hidden chambers in a pyramid would show up in the final image because they blocked fewer particles.

Vin Diesel's Dom Toretto finds his peaceful family man existence violently interrupted yet again in the trailer for Fast X, the 10th main installment (and 11th full-length film) in the wildly successful Fast and Furious franchise.

(Some spoilers for prior films in the franchise below.)

This has been in the works since 2014, later divided into two films that will wrap up the main installments. Justin Lin was originally tapped to direct Fast X, but he exited the project due to "creative differences" one week after filming began in April last year, though Lin co-wrote the film and stayed on as a producer. The Hollywood gossip mill soon kicked into high gear, with reports of on-set clashes between Lin and Diesel, alleging the star was out of shape, struggled with his lines, and was often late to set. Lin also objected to some of the rewrites to his screenplay, and there were reports that after one intense disagreement with Diesel, he exclaimed that the film "is not worth my mental health."

Caltech researchers re-created an experiment on gravity and acceleration that Leonardo da Vinci sketched out in his notebooks. (credit: Caltech)

Caltech engineer Mory Gharib was poring over the digitized notebooks of Leonardo da Vinci one day, looking for sketches of flow visualization to share with his graduate students for inspiration. That's when he noticed several small sketches of triangles, whose geometry seemed to be determined by grains of sand poured out from a jar. Further investigation revealed that Leonardo was attempting to study the nature of gravity, and the little triangles were his attempt to draw an equivalence between gravity and acceleration—well before Isaac Newton came up with his laws of motion, and centuries before Albert Einstein would demonstrate the equivalence principle with his general theory of relativity. [Edited for clarity.] Gharib was even able to re-create a modern version of the experiment.

Gharib and his collaborators described their discovery in a new paper published in the journal Leonardo, noting that, by modern calculations, Leonardo's model produced a value for the gravitational constant (G) to around 97 percent accuracy. What makes this finding even more astonishing is that Leonardo did all this without a means of accurate timekeeping and without the benefit of calculus, which Newton invented in order to develop his laws of motion and universal gravitation in the 1660s.

"We don't know if [Leonardo] did further experiments or probed this question more deeply," Gharib said. "But the fact that he was grappling with the problems in this way—in the early 1500s—demonstrates just how far ahead his thinking was."

Enlarge / Mexican jumping beans are actually seed pods from a shrub native to Mexico with moth larvae living inside. (credit: Devon McKee and A. Pasha Tabatabai/APS 2023)

Mexican jumping beans have been a curiosity for many an inquisitive child, and yes, they really do "jump," thanks to the presence of tiny moth larvae inside the seed pods. According to a recent paper published in the journal Physical Review E by physicists at Seattle University, those jumps can help the moth larvae inside find shade to survive on hot days. And the jumping movements seem to follow a random walk strategy in order to do so.

The notion of a random walk is based in part on the physics concept of Brownian motion. Even though this technically describes random collisions between particles, it's a useful model that can easily be adapted to lots of different systems, biological, physical, or otherwise. The concept dates back to 1827, when a scientist named Robert Brown was studying pollen particles floating in water under a microscope. He noted a strange jittery motion and thought the pollen might perhaps be alive. But when he repeated the experiment using particles of dust, which he knew were not "alive," he still saw the jittery motion.

Brown never determined what caused the motion, but Albert Einstein did, in a 1905 paper in which he sought to confirm the existence of atoms and molecules. Einstein's relevant insight was that molecules in a fluid like water would randomly move about and collide with other small particles suspended in the fluid, like pollen or dust, giving rise to the "jittering" Brown had observed some 80 years earlier.

Enlarge / An early edition of one of Dublin's most famous literary masterpieces: Ulysses by James Joyce, published in 1922. (credit: Fran Caffrey/AFP/Getty Images)

Ulysses, the groundbreaking modernist novel by James Joyce, marked its 100-year anniversary last year; it was first published on February 2, 1922. The poet T.S Eliot declared the novel to be "the most important expression which the present age has found," and Ulysses has accumulated many other fans in the ages since. Count Harry Manos, an English professor at Los Angeles City College, among those fans. Manos is also a fan of physics—so much so, that he penned a December 2021 paper published in The Physics Teacher, detailing how Joyce had sprinkled multiple examples of classical physics throughout the novel.

"The fact that Ulysses contains so much classical physics should not be surprising," Manos wrote. "Joyce’s friend Eugene Jolas observed: 'the range of subjects he [Joyce] enjoyed discussing was a wide one … [including] certain sciences, particularly physics, geometry, and mathematics.' Knowing physics can enhance everyone’s understanding of this novel and enrich its entertainment value. Ulysses exemplifies what physics students (science and non-science majors) and physics teachers should realize, namely, physics and literature are not mutually exclusive."

Ulysses chronicles the life of an ordinary Dublin man named Leopold Bloom over the course of a single day: June 16, 1904 (now celebrated around the world as Bloomsday). While the novel might appear to be unstructured and chaotic, Joyce modeled his narrative on Homer's epic poem the Odyssey; its 18 "episodes" loosely correspond to the 24 books in Homer's epic. Bloom represents Odysseus; his wife Molly Bloom corresponds to Penelope; and aspiring writer Stephen Daedalus—the main character of Joyce's semi-autobiographical A Portrait of the Artist as a Young Man (1916)—represents Telemachus, son of Odysseus and Penelope.

Enlarge / Kittens engage more frequently in reciprocal wrestling ("play-fighting") compared to adult cats, a new study found. (credit: Getty Images)

Anyone with more than one cat in the house knows that the occasional spat or outright cat fight is going to happen. But sometimes it can be tricky to determine whether cats are fighting or just playing rough, because the interaction could feature trademark behaviors of both, according to a recent paper published in the journal Scientific Reports. It's even more challenging to tell whether the fight is just a squabble or a sign that the cats simply can't get along, thereby forcing hard decisions about how to separate the cats—or even whether it's possible to keep the cat(s) in question.

In 2021, co-author Noema Gajdoš‑Kmecová, a veterinarian with the University of Veterinary Medicine and Pharmacy in Košice, Slovakia, and several colleagues published a review paper proposing the development of a common terminology and more of a "psychobiological" approach to the study of cat behavior—particularly when it comes to play behavior. Past studies had focused on a cat's play activity, such as whether it was playing with a toy or another cat. But such observation yields little insight into the function of such play and, by extension, a cat's motives or emotional state.

"When one cat treats another as an object or prey, such activity relates to the former cat seeking to learn about its own skills in relation to manipulating its physical environment (prey are not considered part of the complex social relationships and thus social environment of an individual)," they wrote in that paper. "However, when interaction between cats is reciprocal it may function to facilitate social learning and may be best described as mutual social play." Because such interactions are dynamic, they argued that any functional classification system must be flexible enough to account for such nuances.

In 2011, a horticulturist named Mathias Maier stumbled across an unusual mutant of a Venus flytrap, a carnivorous plant that traps and feeds on insects. Scientists recently discovered that the typical Venus flytrap can actually "count" to five, sparking further research on how the plant manages this remarkable feat. The mutant flytrap might hold the key. According to a new paper published in the journal Current Biology, this mutant flytrap doesn't snap closed in response to stimulation like typical Venus flytraps.

"This mutant has obviously forgotten how to count, which is why I named it Dyscalculia (DYSC)," said co-author Rainer Hedrich, a biophysicist at Julius-Maximilians-Universität Würzburg (JMU) in Bavaria, Germany. (It had previously been called "ERROR.")

As we've reported previously, the Venus flytrap attracts its prey with a pleasing fruity scent. When an insect lands on a leaf, it stimulates the highly sensitive trigger hairs that line the leaf. When the pressure becomes strong enough to bend those hairs, the plant will snap its leaves shut and trap the insect inside. Long cilia grab and hold the insect in place, much like fingers, as the plant begins to secrete digestive juices. The insect is digested slowly over five to 12 days, after which the trap reopens, releasing the dried-out husk of the insect into the wind.

Enlarge / Chaotic shapes 3D-printed in bronze represent the first step in the transformation from chaos to manufacturable forms. (credit: F. Bertacchini/P.S. Pantano/E. Bilotta)

A team of Italian scientists has figured out a way to turn the striking, complex twisting shapes of chaos theory into actual jewelry, according to a new paper published in the journal Chaos. These pieces aren't simply inspired by chaos theory; they were directly created from its mathematical principles.

"Seeing the chaotic shapes transformed into real, polished, shiny, physical jewelry was a great pleasure for the whole team. Touching and wearing them was also extremely exciting," said co-author Eleonora Bilotta of the University of Calabria. "We think it is the same joy that a scientist feels when her theory takes form, or when an artist finishes a painting."

The concept of chaos might suggest complete randomness, but to scientists, it denotes systems that are so sensitive to initial conditions that their output appears random, obscuring their underlying internal rules of order: the stock market, rioting crowds, brain waves during an epileptic seizure, or the weather. In a chaotic system, tiny effects are amplified through repetition until the system goes critical. The roots of today's chaos theory rest on a serendipitous discovery in the 1960s by mathematician-turned-meteorologist Edward Lorenz.

Enlarge / Scientists and conservators are working together to preserve The Night Watch, by Rembrandt van Rijn (1642), for future generations. (credit: Rijskmuseum Amsterdam)

One of the most famous paintings from the Dutch Golden Age is Rembrandt van Rijn's 1642 masterpiece The Night Watch. An interdisciplinary team of researchers has conducted a fresh, in-depth analysis and found rare traces of a compound called lead formate in the painting, according to a recent paper published in the journal Angewandte Chemie. The work was part of the Rijksmuseum's Operation Night Watch, the largest multidisciplinary research and conservation project yet undertaken for Rembrandt's famous painting, devoted to its long-term preservation.

“In Operation Night Watch we focus on Rembrandt’s painting technique, the condition of the painting, and how we can best preserve it for future generations," said Katrien Keune, head of science at Rijksmuseum and professor at the University of Amsterdam (the Netherlands). "The lead formate gives us valuable new clues about the possible use of lead-based oil paint by Rembrandt and the potential impact of oil-based varnishes from past conservation treatments, and the complex chemistry of historic oil paintings.”

Science has become a valuable tool for art conservationists, especially various X-ray imaging methods. For instance, in 2019, we reported on how many of the oil paintings at the Georgia O'Keeffe Museum in Santa Fe, New Mexico, had been developing tiny, pin-sized blisters, almost like acne, for decades. Conservationists and scholars initially assumed the blemishes were grains of sand trapped in the paint. Chemists concluded that the blisters are actually metal carboxylate soaps, the result of a chemical reaction between metal ions in the lead and zinc pigments and fatty acids in the binding medium used in the paint. The soaps start to clump together to form the blisters and migrate through the paint film.

Enlarge / Sample illustration from an Egyptian Book of the Dead—not the newly discovered papyrus—depicting the "weighing of the heart." (credit: Public domain)

Archaeologists have confirmed that a papyrus scroll discovered at the Saqquara necropolis site near Cairo last year does indeed contain texts from the Egyptian Book of the Dead—the first time a complete papyrus has been found in a century, according to Mostafa Waziri, secretary-general of the Supreme Council of Antiquities in Egypt. The scroll has been dubbed the "Waziri papyrus." It is currently being translated into Arabic.

Fans of the 1999 film The Mummy know that the Egyptian Book of the Dead plays a key role in bringing the cursed high priest Imhotep back to terrorize the living. The reality is naturally quite different: notably, there is not one magical copy of the Book of the Dead, as depicted in the film; there were many versions over the centuries, all unique, with the choice of spells often tailored to the specific needs of deceased royals and (later) high-ranking members of Egyptian society.

These "books" were actually collections of funerary texts and spells to help the deceased on their journey through the underworld (Duat)—not to bring people back from the dead—and they are not holy texts like the Bible or Qur-an. They were originally painted onto objects or written on the walls of burial chambers. Over time, illustrations were added and spells were also inscribed on the interior of coffins or the linen shrouds used to wrap the deceased.

Enlarge / HBO's The Last of Us provides a vivid visual imagining of what a Cordyceps infected human might become. (credit: YouTube/HBO Max)

HBO's new sci-fi series The Last of Us debuted earlier this week and is already a massive hit. Based on the critically acclaimed video game of the same name, the series takes place in the 20-year aftermath of a deadly outbreak of mutant fungus that turns humans into monstrous zombie-like creatures (the Infected, or Clickers). While the premise is entirely fictional, it's based on some very real, and fascinating, science.

(Minor spoilers for the series below.)

The first episode showed us the initial outbreak and devastation. Fast-forward 20 years, and the world has become a series of separate totalitarian quarantine zones and independent settlements, with a thriving black market and a rebel militia, known as the Fireflies, making life complicated for the survivors. A hardened smuggler named Joel (Pedro Pascal) is tasked with escorting a teenage girl named Ellie (Bella Ramsey) across the devastated US, battling hostile forces and hordes of zombies, to a Fireflies unit outside the quarantine zone. Ellie is special: She is immune to the deadly fungus, and the hope is that her immunity holds the key to beating the disease.

Enlarge / Oyster mushrooms (Pleurotus ostreatus) serenely growing on a tree trunk in a forest. But nematodes beware! These oyster mushrooms want to eat you—and they have evolved a novel mechanism for paralyzing and killing you. (credit: Arterra/Getty Images)

The oyster mushroom (Pleurotus ostreatus) is a staple of many kinds of cuisine, prized for its mild flavors and a scent vaguely hinting at anise. These cream-colored mushrooms are also one of several types of carnivorous fungi that prey on nematodes (roundworms) in particular. The mushrooms have evolved a novel mechanism for paralyzing and killing its nematode prey: a toxin contained within lollipop-like structures called toxocysts that, when emitted, cause widespread cell death in roundworms within minutes. Scientists have now identified the specific volatile organic compound responsible for this effect, according to a new paper published in the journal Science Advances.

Carnivorous fungi like the oyster mushroom feed on nematodes because these little creatures are plentiful in soil and provide a handy protein source. Different species have evolved various mechanisms for hunting and consuming their prey. For instance, oomycetes are fungus-like organisms that send out "hunter cells" to search for nematodes. Once they find them, they form cysts near the mouth or anus of the roundworms and then inject themselves into the worms to attack the internal organs. Another group of oomycetes uses cells that behave like prey-seeking harpoons, injecting the fungal spores into the worm to seal its fate.

Other fungi produce spores with irritating shapes like stickles or stilettos. The nematodes swallow the spores, which get caught in the esophagus and germinate by puncturing the worm's gut. There are sticky branch-like structures that act like superglue; death collars that detach when nematodes swim through them, injecting themselves into the worms; and a dozen or so fungal species employ snares that constrict in under a second, squeezing the nematodes to death.