Happy Compact Disc Day
It was on this date in 1981 the Compact Disc was first introduced. To impress your friends here's some background on the compact disc (CD), it's a small plastic disc used for the storage of digital data. As originally developed for audio systems, the sound signal is sampled at a rate of 44,100 times a second, then each sample is measured and digitally encoded on the 4 3/4 in (12 cm) disc as a