Here is a demonstration that YOU can do show the Hydrogen fusing together to make Helium!
a regular piece of paper (any size or color)
a very strong hand
Directions: Take the piece of paper and crumple it as much as you can. Make sure there are NO gaps. Imagine that the paper is the Hydrogen and your hand is the star’s gravity. Imagine the paper molecules or Hydrogen fusing together to for a new compound or thing!