How do germs spread (and why do they make us sick)? - Yannay Khaikin and Nicole Mideo

View full lesson: http://ed.ted.com/lessons/how-do-germs-spread-and-why-do-they-make-us-sick-yannay-khaikin-and-nicole-mideo Germs are found on almost every surface we come in contact with,...

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The sun is shining.The birds are singing.It looks like the start of another lovely day.You're walking happily in the park, when, "Ah-choo!"A passing stranger has expelled mucus and saliva from their mouth and nose.You can feel the droplets of moisture land on your skin,but what you can't feel are the thousands, or even millions,of microscopic germs that have covertly traveled through the airand onto your clothing, hands and face.As gross as this scenario sounds,it's actually very common for our bodies to be exposed to disease-causing germs,and most of the time, it's not nearly as obvious.Germs are found on almost every surface we come into contact with.When we talk about germs,we're actually referring to many dif...