After injecting mice with a chemical used to mark proliferating cells, the researchers exposed the animals to an "enriched cage" environment, containing tunnels, shelters, and a running wheel. After several weeks, the researchers again exposed the mice in

You're high above the desert peaks. Your aircraft are approaching their targets. Information from instruments, cameras and radar is before your eyes. And with the help of 100 million pixels of bright and vivid virtual reality you're in control of a swarm

On Nov. 1, 1991, outraged that his doctoral thesis had been passed over for an academic prize, a young physicist at the University of Iowa named Gang Lu opened fire at a physics department meeting. He killed five people and paralyzed another before taking