Earlier this month, millions of Americans looked up at the sky to witness a total eclipse. Now, another cyclical marvel has arrived, this time at our feet. Trillions of noisy, red-eyed insects called cicadas are emerging from the earth after more than a decade of feeding on tree roots.

The United States is home to 15 cicada broods, and in most years at least one of them emerges. This spring, Brood XIX, known as the Great Southern Brood, and Brood XIII, or the Northern Illinois Brood, are emerging simultaneously.

Continue reading “Cicadas Are Emerging Now. How Do They Know When to Come Out?” →

In the early days of the Covid pandemic, a team of scientists called on the World Health Organization to acknowledge that the disease could spread through the air.

Initially, the agency rebuffed them, despite growing evidence that coronavirus-laden droplets stuck around in the air, making indoor spaces hotbeds of infection. The researchers responded with a public campaign, which helped persuade the World Health Organization to finally acknowledge, in late 2021, that Covid was airborne.

Continue reading “W.H.O. Broadens Definition of Airborne Diseases” →

To introduce her children to the hidden marvels of the animal kingdom a few years ago, Anne De Cian stepped into her garden in Paris. Dr. De Cian, a molecular biologist, gathered bits of moss, then came back inside to soak them in water and place them under a microscope. Her children gazed into the eyepiece at strange, eight-legged creatures clambering over the moss.

“They were impressed,” Dr. De Cian said.

Continue reading “What Makes Tiny Tardigrades Nearly Radiation Proof” →

In the early 1900s, primatologists noticed a group of apes in central Africa with a distinctly slender build; they called them “pygmy chimpanzees.” But as the years passed, it became clear that those animals, now known as bonobos, were profoundly different from chimpanzees.

Chimpanzee societies are dominated by males that kill other males, raid the territory of neighboring troops and defend their own ground with border patrols. Male chimpanzees also attack females to coerce them into mating, and sometimes even kill infants. Among bonobos, in contrast, females are dominant. Males do not go on patrols, form alliances or kill other bonobos. And bonobos usually resolve their disputes with sex — lots of it.

Continue reading “No ‘Hippie Ape’: Bonobos Are Often Aggressive, Study Finds” →

In 2002, a crew of paleoanthropologists were working in northwestern Ethiopia when they came across chipped stones and fossilized animal bones — telltale signs of a place where ancient people had once lived.

After years of excavations, the researchers discovered that hunter-gatherers had indeed lived there 74,000 years ago. As described in a study published Wednesday in Nature, these ancient humans were remarkably adaptable. They made arrows to hunt big game. And when their world was turned upside down by a giant volcanic eruption, they adapted and survived.

Continue reading “Fossil Trove From 74,000 Years Ago Points to Remarkably Adaptive Humans” →