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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.
There are more nerve cells in one human brain than there are stars in the Milky Way.
In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.