ALPHA-g is first to observe antihydrogen in freefall.

Scientists have captured the fleeting moment when a heart starts beating, a feat made all the more remarkable when you consider the relative brevity of a zebrafish’s life.

In a tight window about 20 hours into zebrafish development, the embryos’ developing hearts jumped into action, emerging as one from an ensemble of single cells.

“It was like somebody had flipped on a switch,” says Harvard University biophysicist Adam Cohen, senior author of the new study, which imaged zebrafish embryos snug in custom-made agarose molds to capture this once-in-a-lifetime event.

New analysis of trilobite fossil gives clues about ancient creature’s feeding behavior.

Believe it or not, air contains as much water as six times the world’s rivers combined.

This is mostly in the form of water vapor, and it actually replenishes naturally every 8 to 10 days — give or take. This offers a valuable potential reservoir of freshwater that could be tapped relatively easily.

All we need is the right kind of technology.

Scientists believe that Homo sapiens, or modern humans, evolved into our present form approximately 300,000 years ago.

Only a fraction of the planet’s surface will be habitable to mammals when the next supercontinent, Pangaea Ultima, forms.

Unstable nitrogen-9 is the first nucleus known to decay by spitting out five protons.

A newly discovered example of wood construction by humans is nearly 500,000 years old and has archaeologists rethinking how technologically advanced these pre-homo-sapiens may have been.