Leap seconds have helped keep clocks synchronized with Earth’s rotation, but their time is now over – here’s why
300 glaciers have disappeared from the American West since the mid‑20th century – the survivors have a few things in common
Read More 2 minute read Earth Health and Body Math and the Sciences Study Links Toxic Chemicals in Climbing Shoes to Air Pollution in Gyms A new study finds that rubber from climbing shoes releases toxic chemicals into gym air—reaching pollution levels seen on city streets and raising concerns about indoor air quality. byGil CaparasMay 11, 2025