Sunday, February 14, 2016

An Engineer Looks at Kissing on Valentine's Day

From the Smithsonian - Why Do We Kiss?:

"While kissing, couples exchange 9 milliliters of water, 0.7 milligrams of protein, 0.18 mg of organic compounds, 0.71 mg of fats, and 0.45 mg of sodium chloride, along with 10 million to 1 billion bacteria, according to one accounting. Many pathological organisms can be transmitted through mouth-to-mouth contact, including those that cause colds and other respiratory viruses, herpes simplex, tuberculosis, syphilis and strep."


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