Your gut helps write memories, and Maasai herders now guard lions

Cut the vagus nerve, the line running from gut to brain, and that surge disappeared entirely; the rats also got noticeably worse at remembering where they'd just found food. The kicker is what didn't trigger the effect: sugar water with no real nutrition produced nothing, even though it tasted just as sweet. Your brain, it turns out, isn't grading meals on flavor. It's grading them on what they're actually worth, and it's taking notes through your stomach.

He's one of more than 160 men in the "Warriors for Wildlife" program run by the charity African People and Wildlife, which has spent two decades helping villages reinforce their livestock corrals with living walls of thorny commiphora and chain-link, so lions stay out without needing to be killed. For generations, spearing a lion was the ultimate Maasai proof of courage. Now Lorkuta's test of nerve is a stare-off: he holds still, the lion looks at him, and eventually it walks away. Roughly 20,000 to 32,000 lions remain in the wild today, down from 200,000 a century ago, and about half of what's left is concentrated in strongholds like this one.

Carnegie Mellon researchers ran four rhesus macaques through the same kind of test and then compared all the primates against 58 American preschoolers and 79 adults from the Tsimane, an Indigenous farming community in Bolivia. The monkeys didn't just rely on raw visual pattern-matching the way scientists expected; they leaned on abstract, symbolic representations too, the same strategy humans use, and on rotated shapes they used it even more than the preschoolers did.

Scotch, who already knew from his sister-in-law that a person can live well with one kidney, offered his own on the spot 297. Instead of flying to Louisiana, Scotch learned he could donate locally through a "voucher" system that pushed Smith to the top of his own region's waitlist, matching both men with better local candidates than a direct swap ever could have. Scotch's kidney went to a stranger he still knows nothing about; five months later, Smith got his transplant from someone else entirely. His wife Lynn later donated a kidney of her own, and Mark has since donated part of his liver too.

Zanskar's modeling showed the existing wells, drilled only 2,500 feet down, were barely scraping the top of the underground reservoir. They drilled a new well to 8,000 feet instead. It came online in May 2025, and a full year later it's still pumping more than 4,000 gallons of hot water a minute. The plant, in cofounder Joel Edwards' words, has "completely turned around."

He tracked down British-era maps from 1923 showing the raja kaluves, a five-century-old network of channels laid out under city founder Kempe Gowda's original plan to carry rainwater from lake to lake. Decades of construction had buried or blocked them. Walking the old routes against the modern city, Santosh found four historic channels near Muthanallur Lake, one completely erased under encroached land, and worked with residents and local irrigation officials to restore nearly four kilometers of it, reconnecting it to Battalakere Lake. The next monsoon was the test: neighboring areas flooded again. Muthanallur didn't.

Holding the spicy cube measurably calmed people's physical reaction to the worst of the laser pain, though it did nothing for milder heat. The likely mechanism: capsaicin binds to the same TRPV1 receptors that detect dangerous heat throughout the mouth and skin, and the brain may simply have limited bandwidth for tracking two intense burning signals from different parts of the body at once.