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Did you know?

Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

Did you know?

There are approximately 3 million unintended pregnancies in the United States each year.

Did you know?

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

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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

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The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.

Active and passive immunity Active and passive immunity
Purse cover, from the Sutton Hoo burial ship. Purse cover, from the Sutton Hoo burial ship.
How difficult is it for children to learn to speak two languages? How difficult is it for children to learn to speak two languages?
Bolts and screws have many different heads. The head determines what tool is needed. Bolts and screws have many different heads. The head determines what tool is needed.
Passive touch by holding the head lightly. Passive touch by holding the head lightly.
The following sentence is written in the passive voice: The man rode his skateboard to work ... The following sentence is written in the passive voice: The man rode his skateboard to work ...
Video: Introduction to Spirometry

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