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Did you know?

As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

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Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

Male Mandarin Duck Male Mandarin Duck
Male common pochard, London, UK Male common pochard, London, UK
Pelvis Male from side and above Pelvis Male from side and above
Sexual swellings are one way for females to advertise their mating availability, thereby inducing ma Sexual swellings are one way for females to advertise their mating availability, thereby inducing ma
The female and male urinary systems. The female and male urinary systems.
Important Bonds in Biological Molecules Important Bonds in Biological Molecules
Video: HDL (high density lipoprotein)

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