This past winter, Arctic sea ice extent sank to a record low for the 3rd straight year. Now, NASA is looking at the summer melt season's impact on the Arctic's oldest, thickest sea ice.
Researchers identified simple behavioral rules that allow these tiny creatures to collaboratively build elaborate structures - rafts and towers - with no one in charge.
This 5-second video shows a reflected image of the sun - a sun glint - as a bright spot crossing Earth from right to left. It also shows a dark spot - the moon's shadow - moving the opposite way.
Scientists say they’re likely to be tardigrades - tiny, 8-legged marine creatures - which can survive until the sun dies, long after we humans have disappeared.