Cheetah Breaks Land Speed Record.

The fastest cheetah on Earth has done it again, breaking her previous world record for the 100-meter dash and setting a new best time of 5.95 seconds.

This feat surpasses the fastest of all human 100-meter sprinters by almost four seconds. Usain Bolt, a Jamaican sprinter now competing at the 2012 London Olympics, holds the human world record at 9.58 seconds in the 100-meter dash.

Cheetahs, of course, are built to run faster than humans, regularly clocking speeds of up to around 60 miles per hour (96.5 kilometers per hour). During a photo shoot with National Geographic Magazine, a cheetah from the Cincinnati Zoo named Sarah covered 100 meters and clocked a peak speed of 61 mph (98 kph).

The sprint broke Sarah's previous world record, set in 2009 when she ran the same distance in 6.13 seconds. That sprint broke the previous record set in 2001, when a male South African cheetah named Nyana ran 100 meters in 6.19 seconds.The secret to cheetah speed is in its long, flexible spine, which allows the animal to cover up to 22 feet (6.7 meters) on every stride. Cheetahs also vary their strides per second as they speed up, taking more strides per second as they run faster.