Satisfy your scientific curiosity and your craving for some Frosted Flakes. Editor Mike Haney shows you how to use an old cereal box and a CD to build a device that reveals the hidden rainbow inside any light source. Find more examples of DIY spectrometers over at Wikipedia.
PopSci.com 5-Minute Project Video: Cereal Box Spectrometer
Why recycle when you can reuse? Editor Mike builds a Smurfberry Crunch spectrometer