"Christie's stage play The Mousetrap holds the record for the longest initial run: it opened at the Ambassadors Theatre in London on 25 November 1952 and as of 2011 is still running after more than 24,000 performances."
"Her novels have sold roughly four billion copies, and her estate claims that her works rank third, after those of William Shakespeare and the Bible, as the most widely published books."
"While she never received any formal schooling, she did not lack an
education. Her mother believed children should not learn to read until
they were eight, but Agatha taught herself to read at four."