Celebrate Darwin. 5 Shirts on Sale! 2009 is Darwin Year and Progresswear is celebrating with four shirts on sale celebrating the work of Charles Darwin. Believe in Science, Intelligent Design Isn't, Evolve and Believer in Science are all on sale for just $12.99 for the entire year. Join our Mailing List Sign up for special offers and updates. All designs © 2009 Progresswear