Astronomy: When do astronauts eat their lunch? At launch time.
Chemistry: Where do you put dirty dishes? In the zinc.
A neutron walks into a store and asks, “How much for this drink?” The store clerk replies, “For you, no charge.”
Earth Science: “So are you going to visit Egypt?” “Hmm, I sphinx so.”
What should we do with crude oil? Teach it some manners of course!
Biology: What did the biologist wear on his first date? Designer jeans.
Environmental Science: I don't have a Carbon Footprint….Because I drive everywhere.