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Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Did you know?
The longest a person has survived after a heart transplant is 24 years.
Did you know?
Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
Did you know?
Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.