You just tried it, didn't you. Your body shuts itself down after three swallows. Not because something is wrong — because something is working. Your saliva runs out, your food pipe needs protection, and your brain blocks your airway every single time you swallow. It refuses to let you do it a fourth time. Your body has rules you never knew existed. Save this and send it to someone. Watch them try it and fail. Hashtags: #DidYouKnow #BodyFacts #ScienceFacts #HumanBody #MindBlown HealthFacts BrainFacts FunFacts CuriousFacts BiologyFacts AmazingBody ViralFacts LearnSomethingNew ScienceIsWild OneVisionMedia