A lossless compression algorithm that doesn't suck; the anti-.mp3. When a .wav file is compressed with Shorten (.shn), it does not become as small as an .mp3. When it is decompressed, however, it becomes an exact duplicate of the original .wav file. When you decompress an .mp3 file, it is not a bit-for-bit copy -- something has been lost. Try for yourself at etree.org.