Knock knock! Who’s there? It’s Jessi and Squeaks exploring the science of why we laugh!

Love SciShow Kids and want to help support it? Become a patron on Patreon:
  / scishowkids  

Looking for SciShow elsewhere on the internet?
Facebook:   / scishow  
Twitter:   / scishow  
Tumblr:   / scishow  
Instagram:   / thescishow  

SOURCES:

http://www.bbc.com/future/story/20140...
https://science.howstuffworks.com/lif...
https://www.scienceabc.com/humans/sci...
http://www.slate.com/articles/arts/cu...
http://www.nbcnews.com/id/3077386/ns/...
https://www.sciencealert.com/watchhe...
https://www.webmd.com/men/features/wh...