Don't give a dog chocolate! Chocolate affects a dog's heart and nervous system; a few ounces are enough to kill a small dog. See more

The typical laboratory mouse runs 2.5 miles per night on its treadmill. See more

The name for having a fear of long words: Hippopotomonstroses­quippedaliophobia. Ironic, isn't it? See more

If you take a pencil, you can draw a 50 kilometer (31 mile) long line. See more

The blue whale has a heart the size of a small car and its blood vessal is so broad, that a person could swim through it. See more

The longest word in the English language is 1909 letters long and it refers to a distinct part of DNA. See more

Venus is the only planet in the solar system to spin backwards. See more

The telescope on Mount Palomar, California, can see a distance of 7,038,835,200,000,000 million miles. See more

Calculating DNA length for each person, it would stretch across the diameter of the solar system. See more