Science and technology

Associated Press
FILE - This Jan. 4, 2012 file photo provided by NASA shows the Earth taken from the The Visible/Infrared Imager Radiometer Suite instrument aboard NASA's Suomi NPP satellite. This composite image uses a number of swaths of the Earth's surface taken on Jan. 4. International timekeepers are adding a second to the clock at midnight universal time Saturday, June 30, 2012. A combination of factors, including Earth slowing down a bit from the tidal pull of the moon, and an atomic clock that's a hair too fast, means that periodically timekeepers have to synchronize the official atomic clocks. (AP Photo/NASA, File)

View gallery

500 photos

Astronomy, meteorology, environment, archaeology, electronics, computers and gadgets

View Comments