2+ hour, 37+ min ago   (978+ words) Humans consistently walk heel-first, a unique walking style that saves energy but creates higher impact forces on bones and joints. Walking is so familiar that the first moment of each step rarely gets much attention. Humans normally place the heel…...

2+ hour, 55+ min ago   (1023+ words) Researchers reconstructed ancient versions of a bacteria-killing protein found in tears and breast milk, and some were more powerful than the human version. Tears, saliva and breast milk all carry a protein that holds iron away from bacteria, which need…...

20+ hour, 27+ min ago   (1157+ words) Early stress in mitochondria before birth helped mouse hearts resist later chemotherapy damage by creating lasting protective changes. Chemotherapy can save lives, but some drugs can also put the heart under serious strain. Doxorubicin, a chemotherapy used against several cancers,…...

23+ hour, 44+ min ago   (1015+ words) Lakes across northern North America buried carbon at a steady rate for thousands of years, but that changed dramatically after 1850. Leaves, pollen and washed-in soil sink to the bottom of a lake and settle into mud, and the carbon in…...

1+ week, 2+ day ago   (1184+ words) Confidence builds a sense of control, and two brain circuits turn that estimate into how much you learn from a win or a loss. When a job application disappears into silence, you have to decide whether the resume was weak…...

2+ day, 18+ hour ago   (1043+ words) Coral reefs are under growing heat stress, but a new field test suggests researchers may have another tool to help them cope. Coral probiotics have worked in tanks for years, where a researcher controls the water and decides when the…...

2+ day, 21+ hour ago   (1003+ words) Carefully timed sounds can make fluid waves larger in the sleeping brain, giving researchers a new way to study how brain activity and CSF flow are connected. Sleep is often treated as a time when the brain simply shuts down....

3+ day, 16+ hour ago   (1442+ words) A fruit fly can taste food all over its body. New research shows how those signals travel through the brain to control eating. A fruit fly lands on something sweet and its mouthparts unfold toward it. The obvious way to…...

3+ day, 20+ hour ago   (1013+ words) Star formation has fallen by more than half over 4.5 billion years, even as the universe’s supply of atomic hydrogen has barely declined. Stars are being born across the universe at less than half the rate they were 4.5 billion years ago....

3+ day, 20+ hour ago   (1306+ words) Sixteen Asian elephants in Thailand gave up a trunk habit as soon as it stopped working, the first evidence of self-control in the species. Put a piece of fruit where an elephant can see it and smell it, and the…...