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Did you know?

Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.

Did you know?

Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.

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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

Boreal forests, such as this one in Siberian Russia, are dominated by a few species of conifer trees Boreal forests, such as this one in Siberian Russia, are dominated by a few species of conifer trees
Mouse with human liver cells Mouse with human liver cells
Andy Warhol, San Francisco Silverspot, from the series Endangered Species Andy Warhol, San Francisco Silverspot, from the series Endangered Species
The human digestive system The human digestive system
Main body cavities that hold human organs Main body cavities that hold human organs
Loci of Some Human Genes Loci of Some Human Genes
Video: Griffith's experiments

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