The oldest evidence of four-legged animals walking on land has been discovered in southeast Poland. Rocks from a disused quarry record the "footprints" of unknown creatures that lived about 397 million years ago.
People's walking patterns - their gait - are so different they could be used to identify individuals. Gait can also be measured at a distance - an advantage over other forms of biometric identification.
he speed someone walks may predict the likelihood of developing dementia later in life, according to researchers in the US. They also told a conference that grip strength in middle-age was linked to the chance of a stroke.