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Did you know?

A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.

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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.

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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.

Development of the human brain. Development of the human brain.
19 weeks old human fetus 19 weeks old human fetus
Cross Section of the Human Brain Cross Section of the Human Brain
How the neural plate develops into the neural tube during the third and fourth weeks of human ... How the neural plate develops into the neural tube during the third and fourth weeks of human ...
Replication of human immunodeficiency virus Replication of human immunodeficiency virus
Comparison between human chromosome 21 and chimpanzee chromosome 22 Comparison between human chromosome 21 and chimpanzee chromosome 22
Video: Rena arc construction

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