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How long can you watch this video without yawning?

We’ve all heard that yawning is contagious, but is that just an urban legend or hard scientific fact? Test it out for yourself before finding out the explanation with this handy yawn-o-meter! How long can you last before you yawn? I was done before I finished reading the title!

Watch next video What if grocery stores ran their business the way cable companies do?

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