How many trees are there on Earth? Chimp takes down drone in what researchers say was a deliberate action. One TV-watching household s imaginary child watched only PBS, grew up to attract military recruiters. And last but not least: pondering the benefits of last-come, first-served lines.
Photo: Brian Ceballo, left, emerges from the Apple Store on Fifth Avenue as the first to buy the new iPhone 5 to the cheers of store employees Sept. 20, 2013 in New York. Ceballo and a friend waited for 15 days in line outside the store to be the first to buy the phone. But what if the last person in line got to buy an iPhone first? (Stan Honda/AFP/Getty Images)
