The front brakes vs rear brakes comparison has everything to do with friction and heat. From a physics standpoint, the brakes on your car are designed to convert the kinetic energy of your moving vehicle into heat energy, via friction. The result of that energy conversion is what brings your car to a stop.
Mae C. Jemison is the first African-American female astronaut. In 1992, she flew into space aboard the Endeavour, becoming the first African-American woman in space.
Jemison was born in Decatur, Alabama and raised in Chicago. Among her projects is The Earth We Share, which is an international science camp for students aged 12-16. She also hosts and is technical consultant to the Discovery Channel World of Wonders program.