How much of the body is made up of bones?
Strong and light, the skeleton of the average person accounts for less than 20 percent of body weight.
A knockout punch causes a chain reaction in the victim’s circulatory system. The supply of blood pools in the abdomen, reducing circulation to the brain, and resulting in loss of consciousness.
The average body has 14 to 18 square feet of skin.
Man evolved in the Pleistocene epoch, which began about 2.5 million years ago and ended about 10,000 years ago. We now live in the Recent (or Holocene) epoch, beginning about 10,000 years ago.
The earth was formed 4.6 billion years ago.
In a blind test of a new drug, the subject does not know if he or she is receiving the drug or a placebo, but the physician administering the test does know. In a double-blind test, neither the subject nor the physician knows.
Hailstones begin as frozen raindrops or pellets of snow in a thunderstorm cloud. These “hail embryos” are carried by updrafts to a part of the storm where droplets of water exist in a supercooled state (that is, in liquid form at temperatures below freezing). These supercooled droplets freeze into ice when they strike the surface…