Some Light Relief—The Illegal Prime Number!
By now everyone is familiar with DVDs—originally an acronym for “Digital Video Disc,” later changed to “Digital Versatile Disk” for pointless marketing reasons. DVDs are similar to CD-ROMs in many ways, with a crucial difference that commercial DVDs can hold about 8 GBytes, or more than ten times as much data as a CD. The tracks and the bits in the tracks are packed closer together on a DVD, which is why DVD players can read CDs but not vice-versa. If you use a suitable compression technology, you can actually squeeze up to 133 minutes of high-resolution video with several soundtracks and subtitles onto a DVD. The compression is essential, and the movie industry uses the MPEG-2 algorithm that was ...
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