This Week: 3-D printing: Wave of the future
In the News: Losing in politics & sports
Coming Thursday: Social media: Ultimate generosity?
If a piece of toast fell on the floor, would you pick it up and eat it? You probably would if you believe in the 5-second rule, which suggests that your spilled breakfast stays germ-free as long as you snatch it up in five seconds. But while the 5-second rule remains a popular rule of [...]