November+DD

//**Snow is usually formed when temperatures are low and there is moisture- in the form of little crystals of ice in the air~ kind of like raindrops! When they collide together they stick to each other and become snowflakes! If enough of them collide together, the sno**//// **wflake becomes heavy enough to hit the ground** //// **This same process applies to rain** //// **.This process i** //// **s called th** //// **e Bergeron process!** // [|en.wikipedia.org] [|www.cbsnews.com] The CD player has the job of finding and reading the data stored as bumps on the CD. Considering how small the bumps are, the CD player is an amazingly precise piece of equipment. The drive consists of three VERY IMPORTANT components: A ** tracking mechanism ** moves the laser assembly so that the laser's beam can follow the spiral track. The tracking system has to be able to move the laser at micron resolutions.
 * //11/17/14//**
 * HOW SNOW IS FORMED**
 * //11/10/14//**
 * //CATS//**
 * //Cats are the cutest pets EVER. I have a cat of my own as of this weekend, so thats why I chose this for a science discovery.//**
 * //What do cats eat?//**
 * //Cats can eat a lot of different things. Ranging from chocolate wafers (My cat eats those) to cat food, they can eat several different things.//**
 * //How long do cats normally live?//**
 * //As I've done my research, cats usually live to up to 15 years. In some cases, cats can live to be about 20. My cat is 9 years old.//**
 * //What would a cat do on a daily basis?//**
 * //A lot of cats usually sleep for most of the day. But, if you buy cat toys, they will play with cat toys for about 30 minutes. I have a cat toy when its a fake mouse attached to elastic on a stick, and she will play with that FOREVER. Its also very funny to watch her play with.//**
 * //Is it true that cats can be hunters?//**
 * //YES. It is very true.//** ** //My cat, (if we let her outside) will go and hunt for mice and other animals.// **
 * //11/3/2014//**
 * //My science discovery is on CDs. CDs are disks that hold material such as games, music, movies, etc. But the question is: How do they work? Today I will teach you how CDs are read, what they are made out of, and how they store information!//**
 * //First, I will talk about what a CD is made out of. CDs are made out of Polycarbonate Plastic, Aluminum, and Acrylic. The top layer is the label. Now, we will talk about how CDs are made into what they are.//**
 * A ** drive motor ** spins the disc. This drive motor is precisely controlled to rotate between 200 and 500 rpm depending on which track is being read.
 * A ** [|laser] ** and a ** lens system ** focus in on and read the bumps.

Inside the CD player, there is a good bit of computer technology involved in forming the data into understandable data blocks and sending them either to the DAC (in the case of an audio CD) or to the computer (in the case of a [|CD-ROM drive] ).

The main job of the CD player is to focus the laser on the track of bumps. The laser beam passes through the polycarbonate layer, reflects off the aluminum layer and hits a device that detects changes in [|light] . The bumps reflect light differently than the "lands" (the rest of the aluminum layer), and the sensor detects that change in reflectivity. The electronics in the drive interpret the changes in reflectivity in order to read the [|bits]  that make up the [|bytes] . [|What the CD Player Does: Laser Focus - How CDs Work]