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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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![An example of color blindness test. A person with red-green color blindness would not be able to dis](https://biology-forums.com/gallery/47/medium_14755_27_08_12_12_28_10_82021889.jpeg)