Why Do We Laugh When Tickled? 

The Surprising Science Behind Ticklishness 

Animals Get Ticklish Too 

Chimps laugh when tickled  Even rats 'chirp' with joy

2 types of tickles? 

– Knismesis: Light touch (like a hair on your arm) Gargalesis: The laugh-inducing tickle

– Knismesis: Light touch (like a hair on your arm) Gargalesis: The laugh-inducing tickle

Theories on tickle laughter: 

 1.Evolutionary leftover 2. Tension release 3,. Social bonding

Still a Mystery 

Scientists are still studying ticklishness

Scientists are still studying ticklishness