5 bold proposals for cleaning up space junk
A mysterious ancient 'geomagnetic spike' is challenging what we know about Earth
Tropical forests are now producing more carbon dioxide than they soak up
Why do we believe in the kindness of strangers?
Woman thanks homeless man who saved her with a $200,000 crowd-funding campaign
2 more women say Sen. Al Franken touched them inappropriately
Trump offers troops Thanksgiving message via video chat