All for a cracked CD

Oh god. I had no clue this was so complicated.
Jispa found a CD floating around the house. She came to us and asked if this was an important CD. Oh no, that was just around, waiting to be junked. She then asked “Can I put it in the microwave please?” WHAT? Why would you want to do that? “I read somewhere that if you keep the CD in the microwave then it will crack.” Uh ok. I looked at Jasmine and I figured that WTF. Let give it a go. We took a Corel plate and kept the CD on it and put it inside the microwave. In exactly two seconds the CD began to crackle with electricity. It looked so cool. The sparks on the CD looked like how a city looks at night from an airplane. It was pretty cool. We stopped it immediately. Then we started it again for three seconds. Wow. Cool nah? We did it again a couple of times.
Then we removed the CD to see it. The plastic was untouched. It was the mirroring on the CD that was affected. Then I tried to explain that to Jispa. I explained that the CD was actually a transparent plastic disk with troughs on it. so while it looking smooth to you, it actually has many small dimples of sort. Then I had to explain this via a cross section drawing. At first it was difficult to think of the drawing as cross section but eventually she got it.
Then I had to explain how the laser in the CD player throws a laser which bounces back. She then asked me if laser is like electricity. On which I then had to explain how laser is essentially a light beam, narrowly focussed. Like those red lasers which you get. Then I had to explain how light essentially has to bounce for us to see stuff. then I took her to the bathroom with a torch and explained how by merely shining a beam on the mirror you cant see yourself. But if you throw that beam of light on yourself, you can see yourself in the mirror. It merely bounces off the light it gets and hits the eye and hence you see what you see in the mirror. That was one major oh ho moment for her. She thought the mirror works in some other rocket science way. Now that I write about it, I am making a mental note to ask her what did she actually think, on how a mirror works. Then I got the beam on the top of her head and she figured that the light moves in a straight line as her head was illuminated and not her chin.
Now establishing light, we continued to understand the CD and explained to her that the CD language is in dips and troughs or something like that and that the laser (which I showed her on the comp) throws this beam and catches the bounce and understands the language and translates it into the screen image and music. “so, who wrote that language”. Er I don’t know but some body did I guess. “so if you don’t know the language?” “ya you need to know the language. The computer knows the language and then translates it for us”.
Then I had to explain that how the CD goes round and round in a computer and the read goes up and down to read it and that’s how you get to see a movie etc.
Then we went back to the concept of the microwave that sends out an electric signal of sorts that pass through the metal portion and what you see are essential electric sparks on the CD.
Wow this took up at least half an hour, but it was well worth it. Then she decided to take the CD to school as a part of show and tell. I had also explained that the CD would then melt if it would have been heated too much. Today morning as she was putting the CD in her bag, she also wanted to take the small plastic cream bottle that we had kept in the car. That bottle, thanks to it being in the car had twisted out of shape in the car. She wanted to show what happens to plastic if it gets heated too much.
Whew. What a large explanation all because she wanted to see the CD crack in the microwave. Cool nah.
My inspiration for this was Richard Feynman. In the book, 'Surely you are joking Mr. Feynman', he explained that how his dad explained Triboluminescence. It is the light emitted when crystals are crushed. His dad explained that as the blue light you see when you crush sugar. Google search throws this line - “'When you take a lump of sugar and crush it with a pair of pliers in the dark, you can see a bluish flash. Some other crystals do that too. Nobody knows why. The phenomenon is called "triboluminescence."
I even found an online version of this lovely book. You can get it here