Heat can change things!

We thought about how and why we need to heat things up. We looked at a potato but none of us fancied eating it....... and yet oven baked jacket potatoes are one of our favourites!
We took a piece of bread and we examined it, we felt it, smelt it and tasted it. Then we put it in a toaster and waited for it to heat up. It smelt lovely!
When the toast popped up it was no longer soft, flexible, spongey or white. It was quit different. Now it was hard and rigid, golden brown and crunchy.

Could it ever be changed back? No the change was irreversible!