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Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.
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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
![Bronchoscopy. Figure illustrates physician using a bronchoscope to inspect the patient’s bronchial t](https://biology-forums.com/gallery/47/medium_14755_10_09_12_7_14_27_8493756.jpeg)
![The crania, and especially the faces of KNM-ER 1813 and 1470, differ enough that some scientists inc](https://biology-forums.com/gallery/47/medium_275510_22_02_15_6_06_44_207742049.jpeg)