The publishing company behind a number of popular Dr. Seuss iOS apps has put most of its collection on sale in celebration of Theodore Geisel's birthday -- the real Dr. Seuss. The sale runes through March 7th, cutting the prices for all the Dr. Seuss digital books and offering the Dr. Seuss Cat in the Hat camera app free. "We’re delighted to tip our hats to Dr. Seuss and say 'Happy Birthday' with a huge app sale,” said Michel Kripalani, president of Oceanhouse Media. "Dr. Seuss fans look forward to this time of year as a great opportunit