We鈥檝e grown up with the idea that dirt is bad. If you drop food on the floor, don鈥檛 dare to pick it up and eat it. Sanitize your kitchen and bathroom with 鈥済erm killers.鈥� Filter your water. Purify...
What makes us exchange saliva, sebum, bits of food and millions of bacteria with each other?聽In other words, why do we kiss?聽This is not an innate activity.聽South Pacific islanders, for example,...
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