Scientists at Yale and in Singapore have devised what may be the ultimate acid test—a comprehensive model for estimating the origins of Earth's habitability, based in part on ocean acidity.

Earth leakage circuit breakers (ELCBs) were replaced by "ground fault current interruptors" (see GFCI). THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.

NASA astronauts Butch Wilmore and Sunita Williams returned safely to Earth on Tuesday after spending over nine months in ...