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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
There are 60,000 miles of blood vessels in every adult human.
Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.
Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.