Although African-Americans make up only 13% of the U.S. population, they accounted for one half of the estimated new HIV/AIDS diagnoses in 2004.
70
According to one report, it would take 800 marijuana joints to kill a person - but the cause of death would be carbon monoxide poisoning.
176
Human teeth are almost as hard as rocks!
47
Dating back to the 1600's, thermometers were filled with Brandy instead of mercury.
16
Your heart will pump about 212 million liters in its lifetime.
26
Your ears secrete more earwax when you are afraid than when you aren't.
229
When you get goosebumps and your hair stands, the hair helps to trap air, making you feel warmer by keeping in your body heat.
46
The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21