Trickster Richard Wiseman of Quirkology is back with a quick card trick bet that you can never lose. <br /> <br />Simply take 20 playing cards with five cards facing up in any order. Then, challenge your friends that in a matter of seconds you can take the cards behind your back and split them into two groups with the same number of cards facing up. <br /> <br />Can you explain the simple yet ingenious math involved in the trick?
