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Did you know?
According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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Everyone has one nostril that is larger than the other.
![This engraving by William Russell Birch shows Congress Hall (left), which was occupied by Congress f](https://biology-forums.com/gallery/47/medium_374628_16_08_15_9_52_06_222501221.jpeg)
![Martin Van Buren, sitting uncomfortably for this engraving, would eventually ascend to the presidenc](https://biology-forums.com/gallery/47/medium_374628_16_08_15_9_59_54_222701478.jpeg)
![Seven black members of Congress in 1871 are from left to right: Senator Hiram Revels (R-MS) and Repr](https://biology-forums.com/gallery/47/medium_376063_22_08_15_11_28_17_223661853.jpeg)