People around the world are mourning the death of Wangari Muta Maathai, Africa's first woman Nobel laureate and Kenya's foremost environmental conservationist.
A September 2011 report by the U.S. Energy Information Administration says China and India will account for half of a projected increase in energy use.
Measles - one of the world's most contagious diseases - is forging a path through the unvaccinated in the U.S., reaching its highest infection rate since 1996.
After Japan's 2011 earthquake, people speculated that radiation from the Fukushima reactor would travel to California. It did, but only in trace amounts.
Video gamers scored a win for science on a problem that's stumped researchers for over a decade - the structure of a protein linked to AIDS in monkeys.