The White House has declared a state of emergency in Kentucky after a rare, late-season tornado outbreak that cut a swath of destruction 250 miles (400 kilometers) across Arkansas, Kentucky, Missouri and Tennessee, and confirmed to have killed at least 76 people. Tornadoes associated with the same weather system, referredread more

The Earth is reflecting less light from the Sun than it did two decades ago, according to a survey that studies the light of the Earth as it lights up the surface of the Moon. This effect is yet another consequence of the advance of global warming, with the decreaseread more