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Difficulty: Fun On my bookshelf, my favourite book is the third from the left, and it’s the seventh from the right. How many books are there on that shelf?

Written by Alice Ryder Being asked to read a few pages for homework may sound like a chore, but imagine reading more than five million books. That’s what Slovenian physicist Matjaz Perc did to investigate how the use of words in the English language has changed over time.