A study by Copenhagen's Happiness Research Institute finds giving up Facebook leads to increased happiness. Or is the problem too much screen time in general?
Kazakhstan has its own version of Peru's Nazca lines. Hundreds of mysterious earthworks were discovered in 2007 by Dimitriy Dey, as he trawled through satellite images on Google Earth.
New Horizons project scientists present the latest findings about Pluto's remarkable geology, atmosphere and moons to the American Astronomical Society.