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Did you know?

Asthma cases in Americans are about 75% higher today than they were in 1980.

Did you know?

Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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If you could remove all of your skin, it would weigh up to 5 pounds.

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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.

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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

Internal view of the heart illustrating the heart chambers, heart layers, and major blood vessels as Internal view of the heart illustrating the heart chambers, heart layers, and major blood vessels as
External and internal male sex organs External and internal male sex organs
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internal internal
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Video: Replication of DNA and Chromosomes/ How do cells replicate their DNA? (Animation) no Audio

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