Now we're discussing what a particle is. A particle is small, tiny, microscopic things.
The reason we need to know what a particle is, is because in air, water, quicksand, and the wall there are particles. This can help us figure out how it's like to walk through these items.
We can't walk through a wall because it has too many particles and less space, so you cant walk through.
The difference from walking through air and water is, water will take longer then walking trough air.
Hypothesis: The light slows down as it hits the water, thus causing it to bend and change its direction.
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