If you watched the recent GOP debates, you know that Republicans have made it their mission to take away reproductive rights from women. In light of this push, Bill Nye—you know, the science guy—decided to address abortion head-on in a new video, telling anti-abortionists “you literally don’t know what you’re talking about.”

In the video, Nye tackles the idea that life begins at conception, and thus abortion is akin to murder. Nye says this just isn’t true.

“Many, many more hundreds of eggs are fertilized than become humans,” he says, because not all of those eggs will attach to a woman’s uterine wall and result in pregnancy. But if you’re going to hold that as a standard—that life begins at conception and any egg that’s fertilized has the same rights as an individual—well, “Whom do you sue? Whom do you throw in jail?” he asks. “Every woman who has had a fertilized egg pass through her? Every guy whose sperm has fertilized an egg and then it didn’t become a human?”

From there, Nye escalates his argument, saying that legislators who push anti-abortion agendas are straight up “ignorant.” He explains, “It’s a reflection of a deep scientific lack of understanding,” adding, “You [anti-abortionists] literally don’t know what you’re talking about.”

The heart of Nye’s message, however, is that every woman has a right to make decisions about her own body, and at some point, our leaders simply need to “respect the facts.” Preach.

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