By Marc Ashdown - BBC News Education Correspondent

E-books are increasingly being used in classrooms by children as young as three - and they are making a big difference to the reading habits of boys. But there are concerns the expansion of electronic devices in schools may undermine the position of traditional paper books.

E-books, where stories are loaded onto a tablet or laptop, are used in about two-thirds of schools across America, says the School Library Journal.

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