Books are slowly on their way out, being replaced by e-books. To some, it's upsetting. Others are getting creative, like the Eterna Cadencia publishing house.

They decided to print a literary collection of new Latin American authors.  The American version is titled "The Book That Can't Wait." Here's the cool part, it's printed in invisible ink.

Once you remove the book from it's packaging, you have up to four months to read the book. After that, the ink will be gone, and your book looks much the same as a blank diary. It's a sneaky way to get you to read the book fast, and it seems to be working. On the first day of the books release, it sold out completely.