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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?
In 1864, the first barbiturate (barbituric acid) was synthesized.
Did you know?
On average, the stomach produces 2 L of hydrochloric acid per day.
Did you know?
Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
Did you know?
Approximately 500,000 babies are born each year in the United States to teenage mothers.