It's the 75th Anniversary of Penguin Books. In 1935, Allen Lane had a revolutionary idea: publish cheaper, smaller, flexible editions of books - the first pocketbooks - making books more widely available to a wider majority of readers at '...cheap prices.' He believed in the idea so much he invested some of his own money in it when others hesitated.
Of course, skeptics laughed, but here we are 75 years later.
A list of the first ten Penguins published. (A few are still in print.)