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Blood is approximately twice as thick as water because of the cells and other components found in it.
The longest a person has survived after a heart transplant is 24 years.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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