Corona discharge with a discharge current of a few hundred microamperes can blow out a small candle flame within about 1 cm of a discharge point. A pinwheel, with radial metal spokes and pointed tips bent to point along the circumference of a circle, can be made to rotate if energized by a corona discharge; the rotation is due to differential electric attraction between the metal spokes and the space charge shield region that surrounds the tips. Corona discharge A corona discharge is an electrical discharge brought on by the ionization of a fluid such as air surrounding a conductor that is
Marketing of Halo 3 on the gaming community to spread the word itself. The focus on traditional media would help expand the fan base beyond established gamers and convince the public that the game was a cultural milestone. To build public interest, Microsoft made public statements that "Halo 3" would surpass media sales records, including the July 2007 record of $166 million set by the launch of "Harry Potter and the Deathly Hallows". Microsoft's target was to sell 1.5 million copies of the game. Marketing research suggested that the ""Halo" faithful" could only be counted on to buy 75% of that amount, meaning that