The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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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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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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The FDA recognizes 118 routes of administration.
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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.
Body plan of an echinoderm, as represented by a sea star.
Metric conversion using the place value chart.
Common Prefixes of the Metric System
Review of Metric Prefixes
How to convert between imperial and metric units (Part 3)