Blood is approximately twice as thick as water because of the cells and other components found in it.
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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
Smiling and talking to infants
Preschool and child care afford opportunities for many new experiences but also can be stressful for ...
The Impact of Cross-Ethnic Friendships on Minority Students’ Well-Being
Parents who have higher levels of education encourage their children to be educated
An example of continuous variation: biology students organized according to height.
Frequency diagrams of skin colors. (a) Skin color distribution in the parents falls into two discont