Capillaries. The human body has about 25,000 miles of capillaries.

Core System. Sarah, Duchess of York has endorsed the Weight Watcher's program.

60 Minutes. According to the World Health Organization, more than 80% of the world's adolescent population is insufficiently physically active.

60%. Obesity is caused by consuming more calories than are burned off.

Bilirubin. Bilirubin levels can be measured by blood tests.

Rib Cage. In an adult human, the rib cage has 24 bones and the hand 27 bones.