Count the Books on Shelf

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?




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Amazing Facts

Gamers

In 2011, people playing Foldit, an online puzzle game about protein folding, resolved the structure of an enzyme that causes an Aids-like disease in monkeys. Researchers had been working on the problem for 13 years. The gamers solved it in three weeks.