There was a time when you weren't sure if glow in the dark things were light sources or not, because it required light to glow and seemed like just really slow reflection, yet it could produce light when no other source of light was around, amirite? You now know that it is for sure a light source because light is used to reverse a chemical reaction, which then takes place in the forwards direction when there is no light, and is thus chemoluminescence, amirite?
Well fuck, that's a science lesson and a half.
Actually, I've never looked that far into it. Usually I'm just like "Oh hey! A glow stick"
tl;dr, glow sticks were magically cool when you were younger, but now you realize that they're all science-y, amirite?
No they're still magic.