2026-08-19の世界

On August 18, French astronaut Sophie Adenot stepped outside the International Space Station and made history. Working alongside NASA astronaut Anil Menon, she became the first French woman ever to complete a spacewalk. Mission planners had scheduled the excursion, officially called U.S. Spacewalk 97, to replace a Space-to-Ground antenna that had stopped working properly. Wearing bulky white spacesuits, the two astronauts spent 6 hours and 23 minutes working in the vacuum of space. They successfully disconnected cables, loosened bolts, and removed the failed antenna, then carefully strapped it to the station's truss structure so it would not drift away. There was not enough time left to install a replacement antenna, so that task was postponed to a new spacewalk planned for August 25. Even without a new antenna in place, the station kept working normally, because a second Space-to-Ground antenna kept sending signals to mission control in Houston. Adenot is an engineer and former test pilot who arrived at the station only months earlier, and this was the very first spacewalk of her career. For Menon, meanwhile, it was already his second career spacewalk. The spacewalk was also the 282nd ever performed in support of station operations, showing just how much regular maintenance keeps the orbiting laboratory running.

Scientists at the University of Stuttgart just built a tiny robotic muscle inspired by an unlikely source: the curled-up mouthpart of a butterfly. A butterfly's proboscis, the straw-like tube it uses to drink nectar, coils and uncoils in a flash, and the team wanted to copy that trick. Led by materials scientist Zaklina Burghard, the team peeled an ultrathin ceramic film made from vanadium pentoxide mixed with tiny magnetic iron oxide particles, using nothing more than a razor blade. As the film peels away, it automatically curls into a tight microscroll only a few hundred micrometers wide. When researchers hold a magnet near one of these microscrolls, it rapidly unrolls to a length of up to 25 millimeters. Moving the magnet away lets the scroll roll back up on its own, with no other machinery needed. In tests, a single microscroll lifted a load more than 30 times its own weight and kept working perfectly after 5,000 unrolling cycles. Each full cycle of unrolling and rolling happens in about 150 milliseconds, faster than the blink of an eye. Burghard said the real innovation is the scrolling platform itself, since the same trick could work with many other thin-film materials. Researchers hope this butterfly-inspired system could someday power tiny medical devices, sensors, and other micro-robots too small for ordinary motors.

Long before humans invented plastic, nature had already made its own version, and animals have quietly eaten it for ages. Researchers at the Max Planck Institute for Marine Microbiology in Bremen, Germany, studied natural polymers called PHAs, short for polyhydroxyalkanoates, which bacteria store inside their cells as an energy reserve. Scientists had long assumed that only microorganisms could break down these bioplastics. Led by Caroline Zeidler, Nicole Dubilier, and Maggie Sogin, the team studied a gutless marine worm, Olavius algarvensis, which digests bacteria living inside its own body. They found that the worm produces an enzyme that breaks down PHA bioplastics exactly where it digests its bacterial partners, tapping into this hidden energy source. Curious whether other animals shared this ability, the team tested a sponge, an earthworm, and a springtail, and all three degraded the material too. Searching genetic databases, the team found related enzymes in more than 66 species across 9 animal phyla, including marine worms, starfish, and sponges. That wide spread suggests the ability evolved long ago, independently, in many animal groups. As one researcher put it, animals have probably been feeding on nature's original bioplastic for hundreds of millions of years. The discovery could inspire new ways to recycle human-made bioplastics, since industries already use PHAs in packaging, farming, and wound dressings.

Every August 13, the streets of Yanai, a small town in Yamaguchi Prefecture, Japan, glow with thousands of goldfish-shaped lanterns. The tradition began in the Edo period, when a local merchant, Kumatani Rinzaburo, saw nebuta ornaments, big illuminated floats used in festivals in Aomori Prefecture, and decided to make a smaller version back home. Instead of copying the design exactly, he shaped his lanterns like plump goldfish, using bamboo frames covered with washi paper and dyed with the same colors as Yanai's local textile craft. At first, families hung these lanterns outside their homes during Obon, the summer holiday when Japanese people believe ancestors' spirits return to visit, using the soft light to guide the spirits home. Today, the custom has grown into a full festival, and each August 13 night, about 2,500 goldfish lanterns light up the streets between Yanai Station and the old Shirakabe district. A giant illuminated float called the Kingyo Nebuta parades through the crowd, and dancers from a local group called Ryusenkai perform the traditional Kingyo Chochin Odori. Visitors describe the soft, glowing light of the goldfish lanterns as creating a dreamlike atmosphere along the old streets. Local shops in Yanai still make these lanterns by hand, keeping alive a folk craft that could easily have disappeared as paper lanterns fell out of daily use.

With his very last throw of the competition, one javelin thrower turned an ordinary final into history. At the European Athletics Championships in Birmingham, England, 31-year-old German thrower Julian Weber launched his javelin an incredible 90.40 meters on August 15. That throw made him the first man ever to pass 90 meters at the European Championships, breaking the old championship record of 89.72 meters, which Great Britain's Steve Backley had held for 28 years. Weber had struggled with shoulder problems for most of the season and only returned to competition in mid-July, so few expected such a massive throw in the final round. His teammate Nick Thumm took silver with a personal-best throw of 83.76 meters, while Latvia's Patriks Gailums earned bronze at 82.97 meters. Weber's winning throw was also his third career throw beyond 90 meters, following two even longer efforts of 91.51 meters and 91.06 meters at earlier competitions. The win let Weber reclaim the European title he had first won four years earlier in Munich. Only one other man in history, Sri Lanka's Rumesh Pathirage, has ever thrown a javelin past 90 meters, showing just how rare Weber's achievement really is.

A small fossil from Argentina just pushed back one of biology's biggest milestones by tens of millions of years. Researchers at CONICET, Argentina's national science council, studied a fossilized cynodont called Chiniquodon theotonicus. Cynodonts were ancient ancestors of today's mammals. Led by Leandro Gaetano and Adriana Mancuso, the team sliced open a fossil bone and looked at its microscopic growth rings under a microscope. They found something called a neonatal line, a mark that shows exactly when an animal was born. Using that line, scientists calculated the animal's birth weight at about 1.7 kilograms, compared with an adult weight of about 12 kilograms. That ratio, close to 14 percent, matches live-bearing mammals today far more than it matches egg-laying reptiles or birds, whose newborns usually weigh less than 5 percent of an adult. The evidence suggests Chiniquodon gave birth to live young around 236 million years ago, some 90 million years earlier than scientists previously believed live birth evolved. The discovery hints that other mammal traits might also be much older than anyone expected.

Scientists at Rice University just found a strange trick hidden inside one of the world's thinnest materials. Graphene is a sheet of carbon just one atom thick, and it is famous for being incredibly strong and light. Led by professor Pulickel Ajayan, working with researchers from Penn State, the University of Sussex, and other schools, the team studied tiny wrinkles in graphene sheets, each wrinkle far smaller than one billionth of a meter. When they applied about one volt of electricity, sharply curved wrinkles pushed electrons toward one side, creating a small electric charge, almost like a tiny battery. This effect, called flexoelectricity, was already known in other materials, but the team found the charge separation in graphene was between 100,000 and 10 million times stronger than in typical flexoelectric materials. Surprisingly, the sharpness of each wrinkle mattered far more than its height. Ajayan said the discovery shows that geometry alone can reshape how a material behaves electrically, without changing its chemistry at all. The team hopes this simple trick, bending a material into precise shapes, could someday help engineers build thinner sensors and more sensitive electronic devices without needing new chemical materials.

A tomb in Egypt just revealed something archaeologists rarely get to see: seven centuries of changing burial customs, layer by layer. Researchers Jared Carballo-Pérez and Miguel Ángel Molinero Polo, from the University of La Laguna in Spain, studied a side chamber inside Theban Tomb 209, located in the Theban Necropolis across the Nile from Luxor. Inside the small chamber, they found the remains of 16 mummified humans, a mummified dog, and at least 4 more individuals in a disturbed layer, all packed into a space originally built for far fewer burials. The tomb was reused again and again for roughly 700 years, from the Twenty-fifth Dynasty around 754 BCE to the Ptolemaic period, which ended around 30 BCE. The earliest burials were placed in individual coffins with costly imported items, including jars once used for Phoenician trade goods. Centuries later, people were no longer buried in coffins at all, but the bodies were still carefully wrapped, stacked on top of each other, and arranged with their arms folded across the chest in the traditional Osirian pose. About two-thirds of the burials in the chamber show this kind of vertical stacking. Rather than careless overcrowding, the researchers said each new burial was carefully placed around the ones already there, following a clear spatial logic that stayed remarkably consistent across generations.