David Letterman’s Top Ten Reasons Why Network News Producers Do Not Give Science More Air time: 

Number Ten: They are unable to locate file footage of the Big Bang.
Number Nine: They think that high-temperature superconductors are too hot to handle.
Number Eight: El Niño is covered by the weather department.
Number Seven: They already did the O.J. DNA story.
Number Six: They are unable to find information about semiconductors in the music section of the library.
Number Five: They are afraid of reporting on dark matter because they think it is contagious.
Number Four: They are waiting for cold fusion.
Number Three: They think that the greatest scientific achievement is Tang.
Number Two: They wouldn’t know the superconducting supercollider from a hole in the ground.
And the number one reason why network news producers do not give science more air time:

Scientists are from Mars . . . Journalists from Venus.