May I have your attention please you can now book your train tickets on Uber and get

10% back in credits to spend on your next Uber ride so you don't have to walk home in the rain again.

Trains, now on Uber. T's and C's apply. Check the Uber app.

This is scientific American's 60 Second Science.

I'm Christopher Intagata.

Colorful corals may be the stars of the reef,

but they can't thrive without a huge supporting

cast.

The fish perform a load of really important roles on a coral reef.

Tim Gordon, a marine biologist at the University of Exeter.

He says some fish graze on seaweed, clearing space for

new corals, others control whole food chains. But when reefs are bleached or damaged, the fish flee, and the reef

suffers.

So how do you get them back?

Well, one trick may be to play them the sounds

of a healthy, vibrant reef. Gordon and his colleagues played that symphony of snapping shrimp and

whooping, croaking fish on underwater speakers for six weeks at a test

reef built off the coast of Australia.

And at the end of the trial, twice as many fish were living at that vibrant sounding reef,

compared to identically built reefs

outfitted with dummy speakers or no speakers at all.

So fish from every level of the food chain, so herbivores and plantivores and

...