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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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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The human body produces and destroys 15 million blood cells every second.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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The term pharmacology is derived from the Greek words pharmakon("claim, medicine, poison, or remedy") and logos ("study").
Monstrous people from distant lands depicted in a fifteenth-century European woodcut.
The Black Death spread over much of Europe in a three-year period in the middle of the fourteenth ce
The United States in the Caribbean and Central America
Map of North America Flipped
The Universe According to Ptolemy, Second Century A.D.