This video is pretty interesting and put together well.  Usually when you see a long video, its boring for 3/4 of it.  Not this one!

The video addresses 10 popular misconceptions we have about things like cracking your knuckles, drinking 8 glasses of water per day, gum digestion, bottled v.s. tap water,  etc...etc...  Check it out, its pretty cool......

10 Popular Misconceptions - Watch More Funny Videos