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Did you know?

Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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The longest a person has survived after a heart transplant is 24 years.

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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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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.

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Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.

Cellular locations of pattern recognition molecules of the innate immune system Cellular locations of pattern recognition molecules of the innate immune system
Diagram of an endomembrane system Diagram of an endomembrane system
General representation of the autonomic nervous system. General representation of the autonomic nervous system.
Using a water-based cleaning system helps reduce the hazards from using strong chemicals. Using a water-based cleaning system helps reduce the hazards from using strong chemicals.
Chrysler recommends that the bleeder valve be opened whenever refilling the cooling system. Chrysler recommends that the bleeder valve be opened whenever refilling the cooling system.
Solar system Solar system
Video: Hydrogen bonds - role in the body

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