Brian Greene, a theoretical physicist best known for his work with string theory, was recently on “The Colbert Report” to discuss parallel universes. You know, the same stuff you spend hours talking about at the bars.

Greene has been a consultant on shows such as “3rd Rock From The Sun” to ensure Hollywood knows what it’s talking about when it incorporates scientific information in episodes.

Colbert pokes fun of the recent Taco Bell lawsuit over the beef content of its tacos saying, “Is there a universe where Taco Bell serves beef?”

Greene replies that as a vegan, he doesn’t even want to think about it.

Last we heard, Greene was still searching the universe for the ultimate vegan pizza.

The video is below.

Photo: PR Photos

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