They are all tetrapods–that is to say, vertebrates that possess (or their ancestors possessed) chiridian limbs (limbs with digits; fig. 1.1).

The 14-inch wide openings for the air inlets were reduced by means of a winchable curtain to provide an air velocity of 700 to 900 feet per minute.

Our own feeling about thirteen, especially when joined with Friday, has added another to the long list of phobias; treiskaidekaphobia, or fear of the number thirteen (some of the other phobias are the well-known claustro-, acro-, and agora-, fear of being closed in, of heights, of open spaces, respectively; less known are ailurophobia, fear of cats, iatrophobia, fear of doctors, nucleomitotophobia, fear of atomic bombs, mageiricophobia, fear of having to cook, and, recalling FDR, phobophobia, fear of fear itself.)

The Simpsons is a fictional television show.