1001 Space Earth Nature History First Civilisations Ancient Egypt Biblical Times Ancient Greece Ancient Rome Chinese, Japanese Civilisations Indian Civilisation African Civilisation The Early Americas The Rise of Islam The Middle Ages The Renaissance Civil War and Revolution The Industrial Revolution Two World Wars 20th-century Achievements Human World Science and Technology	What has precision engineering achieved? During the 20th century, scientists have built machines that can cut glass to a thickness of 0.035 mm; cut a human hair lengthways 3,000 times; and make a television screen 30.5 mm wide. Lasers have taken precision engineering to new levels   Previous: Back Book: 1001 Section: History Chapter: 20th-century Achievements