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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?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
Did you know?
By definition, when a medication is administered intravenously, its bioavailability is 100%.
Did you know?
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.