Pencil sharpener pencil in position, although they then sharpen them to the usual conical point as for a round pencil, abandoning some distinctive aspects of the carpenter's pencil. Sharpeners with a single blade for use on wax crayons are available, and sometimes included in boxes of crayons. These often have plastic blades, which are adequate for the soft wax. Mechanical pencils dispense the graphite lead progressively during use and thus do not require sharpening; such pencils are sometimes called "self-sharpening". A type of mechanical pencil has a rotating gear mechanism which rotates the lead slightly every time the lead is lifted off
2–0 lead is the worst lead pundit, to suggest that the final result is still in doubt, thereby maintaining audience interest in a game. There is little evidence that 2-0 is the worst lead in practice. In football, a team leading 2-0 at half-time only goes on to lose the game in about 2% of cases. In ice hockey, statistics show that if a team builds a two-goal advantage, they go on to win the game in the majority of instances, and that a one-goal lead is far more dangerous. As a result, the cliché is often used in full knowledge that 2-0 is not in