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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.
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.
Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.