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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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.
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.