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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
There are 60,000 miles of blood vessels in every adult human.
Did you know?
Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
Did you know?
When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).
Did you know?
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

