Dollar bills, cell phones, and radio-tagged badges are letting researchers better track people's movements and interactions.
Astronomers discover three extrasolar planets linked in orbit around their sun
Forelimbs helped the cats pin down prey while they ripped it to shreds
Ultrasonic chirps help bats recognize others from their social group
Listen to a roundup of some of our favorite stories from the week
Reporters are on site for pan-European science meeting
Sudden surge in northern birch forests 15,000 years ago linked to climate change
Giant birds use their wings as "air rudders"
Recreation of early universe in the lab reveals how the cosmos took shape
Study shows that people aren't the only ones to benefit from having many friends