A little while ago, I found a notebook that I started when I was 12. An example of some of the stuff that I wrote about at age 11 or 12 (I posted this in my blog on INTPc a while back):
I understood the concept of infinity from around age 11 or 12 but had trouble picturing an infinite universe in 3D, although I spent a lot of time trying.I wonder what fire actually is and is it made of. Is it a gas or liquid? Why does it only burn some things? Why is it hot? Why does water make it disappear?
How can the universe have existed forever but if it didn't what was there before it? Why is there a sun? How did scientists work out that the universe goes on forever? ... It is very difficult to imagine the universe without anything visible in it because I always imagine it having a top and a bottom. Obeying all rules there is no such thing as top and bottom [of the universe].
...Why are there suns? What is gravity? Why do we have stronger gravity than the moon? ... What is energy? If you let out some air on the moon what would happen to it?