An expert fly fisherman may have as many as 10,000 flies in his collection.
Four million tons of hydrogen dust are destroyed in the sun every second.
During the American Revolution, more inhabitants of the American colonies fought for the British than for the Continental Army.
It snows more in the Grand Canyon than it does in Minneapolis, Minn.
The outdoor temperature can be estimated to within several degrees by timing the chirps of a cricket. Count the number of chirps in a 15-second period and then add 37 to the total. The result will be very close to the actual Fahrenheit temperature.
More than 99.9 percent of all the animal species that have ever lived on earth were extinct before the coming of humans.
A newborn polar bear cub weighs only twice as much as a newborn human – about 15 pounds. Yet when fully grown, polar bears reach weights of up to 1,600 pounds.
It takes a person 15 to 20 minutes to walk once around the Pentagon.
The impressionist painter Claude Monet painted more than 300 pictures of the same lily pads. The now-famous plants grew in a pond behind his house.
A bird sees everything at once in total focus. Whereas the human eye is globular and must adjust to varying distances, the bird’s eye is flat and can take in everything at once in a single glance.
A loss of 20 percent of the body’s water would result in certain and painful death. Ordinarily, the body cannot go more than a week and a half without water; the longest recorded time anyone has gone without water is 11 days.
The lens of the eye continues to grow throughout a person’s life.
In 1976 more people with an income below $3,000 a year owned television sets in the United States than those with an income above $10,000.
