What myths are still widely circulated as truth?

What myth is still widely circulated as truth? from r/AskReddit

found via a digg email 

5 of my favourites 

1) That you have to wait 24h before you can report a missing person. 

 2) People in general though the world was flat until Columbus sailed the ocean blue. 

 3) Lemmings commit mass suicide 

 4) Bulls hate red. They are actually colour blind and are reacting to the movement of the cloth. 

 5) Urine neutralizes jelly fish stings.