Scientists detected the gravitational waves after a pair of unusual black holes collided.
Author Amy Stewart considers the mosquito the most wicked bug of all because of the amount of disease it spreads. Stewart is author of “Wicked Bugs: The Louse that Conquered Napoleon’s Army and other Diabolical Insects.”
This segment originally aired in 2011.
Robin Young and Jeremy Hobson are hitting the road. Our Tumblr brings you behind the scenes of our election coverage.