Early humans probably ate giant sloths
Researchers 3-D print cells and electronics directly on skin
Footprints suggest that humans used to hunt giant sloths for meat
Hedge fund manager of $1.2 trillion in assets to divest from companies that fail to act on climate change
Researchers unveil 3-D printer that could one day print out edible food
Researchers find enough plastic in Arctic Ocean ice to cause flooding
Plastic trapped in Artic ice could be released back into oceans as climate warms, thereby harming aquatic life
Mysterious ice holes in Arctic confuse NASA scientists