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Soul traders or limited company directors in the UK can apply. Hi, I'm Clara Moskowitz, a space editor here at Scientific American.

We're taking a break this week to look back at some of our favorite podcast episodes.

I chose this one about the physics of time travel because I'm a big sci-fi geek

so I'm fascinated by the topic but also it was such a fun debate to have with my colleague

and friend Lee Billings another space editor here we each picked a side colleague and

dug our friend Lee Billings, another space editor here. We each picked a side, I was pro time travel, he was calm, and dug our heels in.

Check it out. We're here today to talk about time travel, a perennial, dare I say timeless, topic of science fiction,

but is it possible?

Is there any chance at all that it could actually happen?

No, no, no, no, no, no, no.

Well, okay, kinda.

Not really.

Erg, uh, I'm Le Billings. I'm Claire Moskowitz and this is Cosmos quickly. The bi-weekly

...