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: www.patreon.com/scishowkids ---------- Looking for SciShow elsewhere on the internet? Facebook: www.facebook.com/scishow Twitter: www.twitter.com/scishow Tumblr: scishow.tumblr.com Instagram: instagram.com/thescishow SOURCES: www.bbc.com/future/story/20140131-why-do-we-laugh-when-tickled science.howstuffworks.com/life/inside-the-mind/emotions/laughter.htm www.scienceabc.com/humans/science-laughter-reason-lol.html www.slate.com/articles/arts/culturebox/features/2014/the_humor_code/why_do_humans_laugh_the_evolutionary_biology_of_laughter.html www.nbcnews.com/id/3077386/ns/technology_and_science-science/t/big-mystery-why-do-we-laughhttps://www.aath.org/do-children-laugh-much-more-often-than-adults-do www.sciencealert.com/watch-here-s-what-happens-to-you-brain-when-you-laugh www.webmd.com/men/features/why-we-laugh