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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.

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How many times has this happened to you?

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You start to fall, but then catch yourself and continue on your way.

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Well, new research shows that falling and catching yourself actually happens every time you take a step.

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And that we precisely place our feet as we walk to avoid taking a tumble during this ambulatory balancing act.

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The study is in the journal Biology Letters.

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When humans walk, we put one foot in front of the other.

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But the way each foot lands can vary from step to step.

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This variation in foot placement can appear pretty random.

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But researchers decided to take a closer look.

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They fitted 10 volunteers with motion caption markers and then watched as the subjects walked on a treadmill.

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The investigators discovered that that they could predict exactly where each foot would fall based on the movement of the person's pelvis during the previous step.

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The body falls forward and sideways as we walk¡ and the feet come down in a way that restores our balance.

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The findings could be useful for developing ways to help people with movement disorders regain their stability.

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The info could also make walking robots more surefooted.

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So they don't, you know, fall down on the job.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.

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