Nelson
“Nelson” reveals much about the English sea Lord and a town in Lancashire of the same name.
However, to English batsmen, Nelson means a score of 111 and is the unluckiest number in the game. The superstitious custom is to remove one or both feet from the ground until the score has moved on.
Why 111? The term was invented in the belief that Lord Nelson was unlucky enough to have had only one eye, one arm and one leg. Nelson wasn’t quite this unfortunate as he actually had two legs, but the cricket term has survived all attempts by historians to correct it.
Retired international cricket umpire David Shepherd kept one leg off the ground by hopping from one foot to the other when the scored reached "Nelson".
Doosra:
This bowling delivery is a variation of the off spinner, developed by the Pakistan test player Saqlain Mushtaq. Conventional off spin is imparted by the fingers of a right handed bowler with the palm facing the batsman, and spins from a right handed batsman’s off side to leg side.
The Doosra employs the same finger spin, but is delivered with the back of the hand facing the batsman and spins from leg to off. “Doosra” is from the Urdu or Hindi for “other” or “second”.
Run Out or Not?
The answer to the tricky question on run outs is that only one batsman can be “run out” at one time. The umpires must apply Law 29 to decide which batsman has to go.
However, in a match between England and the West Indies, a throw from Michael Holding of the West Indies hit one set of wickets before going on to break the other set. Both batsmen were out of their ground, but the umpires were too confused to dismiss either of them.
Source: http://www.cricket-for-parents.com/cricket-facts.html