Well to make a crystal you need to have a solution that has lots of the stuff that makes your crystal dissolved in it. When this happens those molecules start to bunch up but are in no specific order. The special thing about crystals is that all of the molecules line up in perfect order, so at some point, the molecules that are bunched up start to line up together, when this happens you have a crystal!
In my experiments I shoot a laser at these bunches of molecules to MAKE then turn in to a crystal! 🙂
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