1. the myth about eating many cholesterol rich foods while you are still young is okay and when you are old you have to stop is not correct. Plaque build up in your blood vessels builds up as time goes by and can not be removed. Yes. It can never be removed. Unless you cut off the blood vessel itself and perform bypass grafting. As early as now, stop eating cholesterol rich foods. Nesvita's milks and other milk products don't remove cholesterol in the vessels, they just prevent free cholesterol in the body from going to the vessels.
2. when you encounter a fracture, your new bone is stronger than the old bone. Therefore the risk of breaking the new bone is very less already. (don't have any ideas on breaking all your bones and renewing them so that they will all become stronger).
3. there is no such thing as a Universal donor (blood) and a Universal recepient. O, as much as possible must receive O and AB must receive AB. (we can never be too sure)
4. hair grows for 2 years and rests for 3 months. In other words, hair stops growing for 3 months after actively growing for 2 years.
5. your left lung is smaller than your right lung.
6. Arteries are colored red, right? That's because the blood that goes through them carries oxygen. But Veins are not blue, as shown in many books. Actually, they are maroon because they carry CO2 and wastes.
7. the heartbeat of humans can be heard at the left portion of the chest, right? Well, a dog's heartbeat can be heard more clearly at the right side of their chests. (try it with your pets..)
anyway, these are just a few... i can't remember the others... so much for that..