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Did you know?
The horizontal fraction bar was introduced by the Arabs.
Did you know?
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Did you know?
Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.
Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.