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Take a CD or CD-R which is defunct or useless and place it in a microwave oven, standing up in the middle against a glass or paper cup. Do not use metal materials as a holder.
Set the microwave for high on five seconds. Close the door completely shut and start cooking.
Be prepared to stop the microwave when the CD starts smoking. These fumes are unhealthy when inhaled. A well-aired room beforehand, such as an open window near the oven, will help eliminate the smoke effectively.
Enjoy the show. The heated aluminum of the CD creates a very small electrical storm complete with lightning and sparks. You can observe all this activity through the oven door, though normal precautions have to be taken.
Wait for a few seconds before retrieving the CD. Even after just five seconds the disc can be conducting electrical currents. Touching a freshly-destroyed CD with bare hands could burn you. Do not inhale the air outside the oven just after a session. Let the microwave cool and air the room out by opening windows.
Observe the layers of the CD. Notice the different patterns and paths etched over the material creating tiny metallic "islands".
Finished.
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