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The Queen has posted her first ever message to Instagram as she opened the Science Museum's summer exhibition.

With the swipe of an iPad, she shared an image of a letter from 19th century inventor Charles Babbage to Prince Albert - her great-great-grandfather.
 
Known as the first ever computer pioneer, Babbage wrote to Albert in 1943 about his Analytical Engine, a machine that could make calculations using punched cards and had a memory unit to store numbers.