Then, in 1991, researchers discovered a 120-mile-wide, 1.5-mile-deep crater called Chicxulub in Mexico of the same age as the K-T boundary.

Choosing gan active way to get to work could make a big difference in how much weight creeps on in middle age, a large U. K. study suggests.

Data from a long-term study launched in the U. K. in 1946 shows that such working moms are the least likely to be obese by middle age and the most likely to report generally good health.