Whoopi Goldberg sparks a weed conversation in this exclusive StarTalk clip

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StarTalk returns to National Geographic on September 19 for a third season of Neil deGrasse Tyson chatting with various luminaries—both in and outside of the field of science—about everything from Star Trek to science education to medical marijuana. Whoopi Goldberg will actually lead the discussion on that last topic in the season three premiere. The View host is, after all, a staunch advocate of cannabis, and even runs a medical-marijuana company called Om Edibles. The A.V. Club has an exclusive clip of Tyson and Goldberg hashing out the particulars of the criminalization of the drug, which leads all the way back to Richard Nixon (it figures).