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yeah, just put the glowstick in the freezer, it wont glow as much but it lasts longer!

If you put a glowstick in the freezer, its light slowly dims before fully going out.

yes, the liquid inside of a glowstick is poisonous. if it cracks and gets on you, wash your hands. if you eat it, find a doctor ASAP.

Chemical lightsticks glow by way of two chemicals; cyalume and hydrogen peroxide. Inside the glowstick is a thin glass tube; inside of that is a chemical known as hydrogen peroxide. Outside of this tube, there is a chemical known as cyalume. When a glowstick is "cracked", the glass tube is broken, and when a glowstick is shaken the two chemicals mix together. These chemicals also activate a die of whatever colour the glowstick may be (pink, white, orange, green, red, etc.), causing the stick to "glow".