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The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
Blood is approximately twice as thick as water because of the cells and other components found in it.