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Venus has long been called Earth’s twin, because our sizes are so similar. But as we learned in the early 60s, on our surface we couldn’t be more different. This wasn’t always the case though. It’s thought that up until about 500 million years ago, our planets were very similar, in fact Venus may have supported life. So what happened?

Intro produced by Cooper Carr, edited by Nick Turnbow, with special makeup effects by Sara Bachmeyer

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