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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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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.

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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.

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Excessive alcohol use costs the country approximately $235 billion every year.

Common locations for cerebral artery aneurysms in the Circle of Willis. Common locations for cerebral artery aneurysms in the Circle of Willis.
Grieving behavior can have common expressions in different cultures. Grieving behavior can have common expressions in different cultures.
Play in Four Cultures Across cultures, play is the most common activity in early childhood. Source: Play in Four Cultures Across cultures, play is the most common activity in early childhood. Source:
The common rail on a Cummins diesel engine. A high-pressure pump (up to 30,000 PSI) is used to ... The common rail on a Cummins diesel engine. A high-pressure pump (up to 30,000 PSI) is used to ...
This living protozoan is the common Paramecium multimicronucleatum that moves by means of its numero This living protozoan is the common Paramecium multimicronucleatum that moves by means of its numero
Kindergarten school year book Kindergarten school year book
Video: Carbon fixing adaptations Animation

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