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There are more nerve cells in one human brain than there are stars in the Milky Way.
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
If you use artificial sweeteners, such as cyclamates, your eyes may be more sensitive to light. Other factors that will make your eyes more sensitive to light include use of antibiotics, oral contraceptives, hypertension medications, diuretics, and antidiabetic medications.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.