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Author Question: Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.0 m ... (Read 2163 times) |
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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There are more nerve cells in one human brain than there are stars in the Milky Way.