Millennium Force record for tallest and fastest roller coaster at Cedar Point until 2003, when Cedar Point debuted Top Thrill Dragster, which at the time was the tallest and fastest roller coaster in the world. Millennium Force has held records for the following: Cedar Point has held records for the following (May 2000 statistic on left and May 2013 statistic on right): As both a high altitude and high velocity ride, Millennium Force is affected by unfavorable weather conditions such as rain, lightning or strong winds; under these conditions the ride is closed, but in light rain it can remain open. There
MKM steel MKM steel MKM steel, an alloy containing nickel and aluminum, was developed in 1931 by the Japanese metallurgist Tokuhichi Mishima. While conducting research into the properties of nickel, Mishima discovered that a strongly magnetic steel could be created by adding aluminum to non-magnetic nickel steel. The developers claim MKM steel is tough and durable, inexpensive to produce, maintains strong magnetism when miniaturized and can produce a stable magnetic force in spite of temperature changes or vibration. MKM steel is similar to Alnico. MKM is an acronym for Mitsujima ka magnetic, 'Mitsujima ka' being the name of the inventor's childhood home.