Thanks to a writing staff that includes ex-computer-scientists and former mathematicians, the show also has cachet among real scientists. Renowned astrophysicist Stephen Hawking—whom Homer refers to as "that wheelchair guy" in the 3D episode—even guest-starred at one point. Other science types making guest appearances have included Steven Jay Gould, who visited Springfield to investigate Lisa's angel skeleton ("Can I use your bathroom?") and astronaut Buzz Aldrin ("Homer, no!").