Scientists detected the gravitational waves after a pair of unusual black holes collided.
In 2004, two teams of scientist-explorers delved into caves in southern Mexico and the former Soviet republic of Georgia to find out which one went the farthest down. We revisit a conversation we had with James Tabor, who chronicled the quest in the book, “Blind Descent: The Quest to Discover the Deepest Cave on Earth” which was recently released in paperback.
Robin Young and Jeremy Hobson are hitting the road. Our Tumblr brings you behind the scenes of our election coverage.