Carbon fiber may not be the most interesting of topics, but it's helping to power one of the more competitive races during the winter games. BMW USA assigned a team of engineers to work with top American bobsledders to rebuild the skeleton design from scratch, The Washington Post reports. By using the carbon-based material, often used in aerospace applications, the weight of the craft was reduced enough to create a lighter, more centralized mass. Ergonomics are also important, such as streamlining the interior, making it easier for the athletes to "jump" in from their running start.