But analysis of the motion of Ulysses, another space probe, has shown that it, too, is affected by the mysterious acceleration.

ECONOMIST: A space oddity

Frame-by-frame analysis of the motion of individual soot particles then reveals how quickly gases within the fire are moving, and allows fire behaviour to be scrutinised in detail.

ECONOMIST: Next, the fire forecast

It can take a lot of effort to walk for people whose gait isn't smooth, and they are more prone to falls, according to Amy Bastian, director of the Motion Analysis Lab at Kennedy Krieger Institute, Baltimore.

WSJ: Split-Belt Treadmill Therapy for Stroke Patients

In the early 17th century, Johannes Kepler worked out the laws of planetary motion as a result of years of analysis of the observations made by Tycho Brahe.

ECONOMIST: Mining the digital skies

The hard corset significantly decreased lower-back or lumbar range of motion in all phases of the golf swing compared with the soft corset and no corset, the motion analysis showed.

WSJ: Will Corsets Help Golf-Related Back Pain?

An analysis of money flow trends shows that money is coming out of Apple and going into Nokia, Research In Motion, and Facebook (FB).

FORBES: Money Flying Out Of Apple Stock. Flocking To Facebook, RIM, Nokia