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Author Question: The lowest A on a piano has a frequency of 27.5 Hz. If the tension in the 2.00-m string is 308 N, ... (Read 32 times) |
Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
In 1864, the first barbiturate (barbituric acid) was synthesized.
Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.