Used coffee grounds

I think I want to see one.

Jim, what do you do with your coffee grounds?

Well, I drink instant actually.

No, but when there are grounds, I compost them.

Some people use coffee grounds in their hair, don't they? But I read that doesn't work apparently to grow hair.

well, it may not work in hair, but it certainly works in all places in concrete.

It's been discovered.

So these scientists in Australia, they've found that charred coffee grounds can make concrete up to 30% stronger.