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This is Scientific American 60 Second Science.

I'm Suzanne Bard.

Anyone who commutes by car knows that traffic jams are an inevitable part of life, but humans are not alone in facing potential backups.

Ants also commute between their nest and sources of food. The survival of their colonies depends on doing this efficiently. The more they are, the more food they're going to bring back, but at the same time, they

might end up with traffic jam because there are too many of them.

Arizona State University mathematician Sebastian Much.

When humans commute, there's a point at which cars become dense enough to slow down the flow of traffic, causing gridlock.

Much and his colleagues wanted to know if ants on the move could also get clogged,

so they manipulated traffic density by constructing bridges of various widths between a colony of Argentine ants and a source of food.

Then they waited and watched.

The goal was to try to find out at one point they're going to have a traffic jam.

But it appears that that never happened.

They never at one point just stopped.

They always managed to avoid traffic jam.

The flow of ants did increase initially as ants started to fill the bridge

and then leveled off at high densities. But it never slowed down even when the bridge was

...