Black diamonds are extremely rare, and are found naturally only in Brazil and Central Africa. The cosmic origin theory of "The Enigma" is based on carbon isotopes and high hydrogen content.
Last year, half of all New Year's resolutions in the U.S. were based on fitness and nearly half were based on weight loss. NPR's Life Kit takes a look at diet culture.
NPR's Scott Simon speaks to George Kourounis, Royal Canadian Geographical Society's explorer-in-residence, about the possible closing of "The Gates of Hell," a natural gas field in Turkmenistan.
Bald eagles, hailed an "American success story" were removed from the endangered species list in 2007. Now, researchers have found that lead ammunition has reduced their population growth.