It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
Species-rich floras of chalk grassland compared to species-poor floras of acid soils.
A typical hacksaw that is used to cut metal. If cutting sheet metal or thin objects, then use a ...
A typical oil pump mounted in the front cover of the engine that is driven by the crankshaft.
Poor single parents and their children
The genome of a typical retrovirus is shown at the top of the diagram
In a typical proteomic analysis, cells are exposed to different conditions