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Science is full of momentous discoveries, the impact of which has driven technology, medicine, policy and understanding forwards, starting new fields of study and ultimately changing the world. Breakthroughs such as: Using fingerprints as a way to identify criminals in 1880, Watson and Crick deciphering the structure of DNA in 1953, the first discovery of a planet outside our solar system in 1995 and the cloning of Dolly the sheep in 1997.