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Did you know?
The horizontal fraction bar was introduced by the Arabs.
Did you know?
Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.
Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
Did you know?
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.