I gave this to a good friend that is a teacher. Although he likes most of the shirts you have, he can't wear many to school. They will offend the kiddies (high school students). But he was very happy to get the Caffeine Molecule shirt. He drinks coffee all day and he has to hide his coffeemaker from the kids. He said the shirt is great for school because "it's sciencey". another satisfied caffiend.
This was a gift for a teacher friend that cannot wear anything objectionable. He loved it. He said it was "sciencey".