I just impulse-bought ten laser diodes. Now what?

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I'm quarantined like everybody else, so it's not like I have a lab or anything. I really just have basic electronic components (breadboard, resistors, arduino, etc.). I guess I should mention I have a 3D printer too. I had to order some supplies on amazon for a work project, and I ended up adding a bunch of laser diodes to the order for fun.

4chan, tell me what to do with the 10 laser diodes.