Understanding the human body is a team effort. That's where the Yachtel group comes in.

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This is Scientific Americans' 60-second science.

I'm Karen Hopkins. This will just take a minute. You're strolling down the street, or maybe hauling that load of laundry down a flight of stairs,

when all of a sudden, your laces come undone.

If you've ever pondered what precipitates this pedestrian wardrobe malfunction,

you might want to tie your shoes and beat a path to the

proceedings of the Royal Society A. In that journal, researchers have trotted out data that show

that a combination of whipping and stomping forces laces to unravel without warning.

The investigators noted that shoe lace knots frequently fail when people are walking,

but not when they're, say, sitting on the edge of a table and swinging their legs.

Laces also stay tight when marching in place with no forward motion.

That led the gum shoes to suspect that stepping and swinging somehow worked together

to foil footwear security.

But how? To untangle this knot problem, the researchers made a slow-mo video of a student running on a treadmill,

thus recording the literal steps that lead to catastrophic knot failure. Here's what they slowly saw.

When the foot strikes the ground, the force of the impact causes the knot at the

center of the lace to deform and stretch. And when the foot swings forward, the ends of the

...