For me the one thing that blew my mind was how popcorn is made I can’t explain it perfectly but what I understand about it goes something like this.
Popcorn piece thingy ( can’t remember what it’s called) explodes .
It’s liquid inside becomes outside.
Liquid comes into contact with air.
Then it probably has something to do with particles and the liquid becomes solid and all of a sudden you have popcorn. 🙂

Now what is the one thing that blew your mind?