If you’ve ever gone out hiking in the wilderness, there’s a chance – depending on where you live, of course – that you might have come across a rattlesnake. Or at least heard one. The noise of their rattling tails is uniquely distinct. Once you hear it, you know exactly what it is…

But what is it, exactly? What is it that makes that noise? Do they just have a bunch of M&M’s in there? Or is there something else going on? Well, you’re about to find out.

The experimenting father and son duo behind ‘What’s Inside?’ are asking the question and finding out the answer. They’ve got hold of a dead rattlesnake’s tail and a sharp blade and they’re cutting it open to find out what’s inside. So if you’ve ever contemplated what makes a rattlesnake rattle – you’re about to discover the answer!