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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

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The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.

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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

Evolutionary changes in the shape of oyster shells. Evolutionary changes in the shape of oyster shells.
Superior view of heart valves illustrating position, size, and shape of each valve. Superior view of heart valves illustrating position, size, and shape of each valve.
SICKLE SHAPE SICKLE SHAPE
Who Takes Care of the Children While the Mothers Are at Work? Who Takes Care of the Children While the Mothers Are at Work?
Summer squash exhibiting various fruit-shape phenotypes, including disc, long, and sphere Summer squash exhibiting various fruit-shape phenotypes, including disc, long, and sphere
Chromosome shape Chromosome shape
Video: X chromosome inactivation in calico cats

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