The coldest city in the U.S. is International Falls, Minnesota. | In 1871, horse cars were introduced. It was simply a car that was pulled over a track by a horse. | A dog by the name of Laika was launched into space aboard the Russian spacecraft Sputnik 2 in 1957. | A bolt of lightning can reach temperatures hotter than 50,000 degrees Fahrenheit - five times hotter than the sun. | Polar bear fur is transparent, not white.

A year from now you will wish you had started today.