What are the Top Ten Worst Jobs in History? Read about the ten most revolting, difficult and dangerous jobs that children had to do in the past. Oxford Reading Tree inFact is a non-fiction series that aims to engage children in reading for pleasure as powerfully as fiction does. The variety of topics means there are books to interest every child in this compelling series. The series is written by top children's authors and subject experts. The books are carefully levelled, making it easy to match every child to the right book.