If you were able to travel back in time two thousand years and meet one of your ancient ancestors, you'd be able to blow their mind with technology. Imagine what someone living so long ago would think of your mobile phone or your smartwatch!

Don't let that thought make you feel superior, though, because they might be able to show you a mind-blowing thing or two in return.

There's a great deal that we don't understand about the technology of our ancestors, as you're about to find out!