Celebrity impression: Elvis during his last minutes. "It involves lots of peanut butter," says Rocky. "It's not a pretty sight."
Best part about being a scientist: It shuts up those irritating, chatty people on airplanes. "Tell someone you're a theoretical astrophysicist and they quickly turn their attentions back to the in-flight magazines."
Favorite candidate for dark matter: The light photino (Remember, you heard it here, first).
Best blackboards: At Fermilab, every office has at least one that stretches from the floor to the ceiling.
Favorite elements: Hydrogen and helium. "They make up 99 percent of the universe," he says.
Biggest secret: He was the fifth Beatle.
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