First Kisses and Spring!

Hank explores the science behind the first kiss — and all the kisses that come after it — and also sets you straight about the vernal equinox, what it is, and why this year’s is special!

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http://people.howstuffworks.com/kissing.htm
http://www.springer.com/psychology/personality+%26+social+psychology/journal/10508

http://www.space.com/881-date-changed-start-spring.html
http://earthsky.org/astronomy-essentials/everything-you-need-to-know-vernal-or-spring-equinox

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