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Hey, Smartypants, be honest.

When you're looking out a big window, have you ever been tempted to smush your face up against it?

Or maybe you like to breathe on it?

So you can write your name.

narrator was here.

Mr. narrator, I just cleaned these windows.

Sorry, couldn't help myself.

So, do you do that too?

No, just me.

Hmm, anyway, though you might take a glass for granted, and it can be hard to keep clean.

Stop touching the glass.

You're making finger prints.

Sorry, as I was saying, glass plays a major part of your everyday life.

And not just your life, but your parents, your grandparents, and most likely all the way back, back, back, back, back,

towards the deepest roots of your family tree.

Sound farfetched?

Well, the earliest man-made glass dates back to around 3,500 BC.

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