Turn a CD Disc Into a Working Metal DetectorMore for You KSAT anchor goes viral for 'speaking the truth' about Texas leaders Dumb Things In The Big Bang Theory That Everyone Ignores Abnormal heat ...

Make a truth teller for light. Turn an old CD into a spectroscope to analyze light—you may be surprised by what you see. Try pointing your CD spectroscope at the fluorescent light in your room, sunlit ...