There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
Vertebral compression Fractures of the spine (vertebra) can cause severe ”band-like” pain that radia
Observed Mother–Child Arguments at Five Time Points Over an Eight-Year Period
Foods for Baby’s First Year
Out of Many: A History of the American People
Portrait of Typical 12-year-old Boy and Girl, 1981 and 2007-2009
Loss of brain cells in a transgenic Huntington-disease mouse. (a) Section of normal mouse-brain stri