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This week's show is sponsored by into the mix. In an upcoming episode, shall talk to the founders of whoop about why it's been important to infuse their company with social justice values beyond tasty ice cream. For just a few days, you can start using your whoop to get the most out of your sleep, recovery and exercise. Their fordato is officially back in stock and shipping in real time.

Was there a technologically advanced species living on Earth long before humans? And if one had existed, how would we know?

This is the first episode of our new four-part series, Lost Worlds.

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