The Key Lime

mental_floss on tumblr: The Paperback Revolution

mentalflossr:

Half a century before e-books turned publishing upside down, a different format threatened to destroy the industry.

Here’s a little perspective: In 1939, gas cost 10 cents a gallon at the pump. A movie ticket set you back 20 cents. John Steinbeck’s The Grapes of Wrath, the year’s…