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Did you know?
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
Did you know?
The human body produces and destroys 15 million blood cells every second.
Did you know?
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.
Did you know?
Everyone has one nostril that is larger than the other.
Did you know?
Asthma cases in Americans are about 75% higher today than they were in 1980.