By Associated Press

Here's something really breathtaking: a breath tester that measures the amount of gas cows burp up!

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Cows are the world's biggest belchers - they burp about once every 40 seconds, reports 3-2-1 Contact magazine. That also makes them big producers of methane gas. (Methane helps cause global warming by trapping heat in the atmosphere.) Problem is, climate researchers have had a hard time figuring out exactly how much methane cows belch.But now they can, thanks to Patrick Zimmerman's invention. It's a container that hangs around the cow's neck. The device lets reseachers "cow-culate" how much gas is released in the atmosphere.

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