You see Billy, the kind of light your eyes see goes through glass, but bounces off tin foil instead. This is because of what different things are made of. You know how sometimes you try to go into the kitchen but then your brother jumps out and wrestles you so you can’t go through the door? It’s a little like that. Some types of things wrestle the light and either grab it or push it back, but other things just let the light go right through.
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