The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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Thyroid conditions may make getting pregnant impossible.
Sporic life cycles
The processes involved in urine formation.
Carbon dioxide: The anthropogenic greenhouse gas of primary concern