The Ultimate LED glow stick
Around Halloween, glow sticks are widely used to keep trick-or-treaters visible on dark streets. At concerts, people wave them about instead of using lighters (sensible). On the 4th of July, vendors dispatch hundreds of glowy sticks for people to play with and enjoy before the real light show in the sky begins. What if you could build a glow stick that had 2 (yes, two) colors? Watch the video to learn how to create one.