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 3 minute read History Nature Neanderthal gene variant linked to reduced athletic performance in modern humans A gene variant inherited from Neanderthals produces a less efficient muscle enzyme, which may explain why some modern humans are less likely to become top-level athletes. byModern Sciences TeamJuly 22, 2025