MP3: The Definitive Guide MP3, standing for MPEG-1, Layer 3, is a codec for compressing the size of audio files for digital distribution. Much more than a definition, MP3 is nothing less than a cultural and economic revolution on the Internet. Every day, hundreds of thousands of MP3 music files are searched for, shared, recorded and listened to by computer and Internet... The New York City Subway System (Building America: Then and Now) In 1912, workers digging to create the Broadway Subway, north of Murray Street in lower Manhattan, hit a brick wall approximately 21 feet (6.4 meters) below the street surface. Breaking through the wall, the laborers came upon a tunnel 9 feet (2.7 m) in diameter and lined with eight- inch- thick (20.32 centimeters) bricks. Two rails led into a...
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