An adult human heart weighs about 10 ounces and beats over 100,000 times a day See more

One quarter of the bones in your body, are in your feet. See more

There are 206 bones in your skeleton. See more

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

Human thigh bones are stronger than concrete. See more

The cigarette lighter was invented before the match. See more

Lightning strikes about 6,000 times per minute on this planet. See more

After billions of years, black holes become white holes and they spit out all the things they sucked up. See more

It takes about 20 seconds for a red blood cell to circle the whole body. See more