The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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There are immediate benefits of chiropractic adjustments that are visible via magnetic resonance imaging (MRI). It shows that spinal manipulation therapy is effective in decreasing pain and increasing the gaps between the vertebrae, reducing pressure that leads to pain.
The carbon cycle.
Life-cycle of the Sun; sizes are not drawn to scale
TCA Cycle
The life cycle of Dictyostelium
The menstrual cycle.
Life cycle of the beef tapeworm (Taenia saginata).