What is a knuckleball?

A term and concept borrowed from baseball, a knuckle ball (or knuckleball) in cricket is a delivery that arrives at a speed that is much lesser than a bowler’s average speed. Image sources: https://en.wikipedia.org/wiki/File:Wakefield_Throws_a_Knuckleball.jpg This delivery has been around for donkey’s years (if you are to believe what the local club’s ex-cricketers have to say) but has suddenly become all the rage. So, what is the knuckle ball? Remember Zaheer Khan beating Michael Hussey to knock back his off stump in the ICC Cricket World Cup 2011? The seemingly innocuous delivery beat Mr. Cricket for pace and found its way through the gate. That was an excellent example of the effectiveness of the knuckle ball.