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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

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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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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.

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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.

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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.

Normal development of posture and spinal curves. (A) Toddler: Protruding abdomen; lumbar lordosis. ( Normal development of posture and spinal curves. (A) Toddler: Protruding abdomen; lumbar lordosis. (
Secondary School Enrollment Worldwide Secondary School Enrollment Worldwide
School age (late childhood): 6–12 years, or to puberty. School age (late childhood): 6–12 years, or to puberty.
School is over—but not for this student. After the regular school day, hundreds of thousands in ... School is over—but not for this student. After the regular school day, hundreds of thousands in ...
Algorithm for assessing a patient at risk for self-directed violence. Algorithm for assessing a patient at risk for self-directed violence.
The National School Lunch Program The National School Lunch Program
Video: DNA close up Animation

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