Return of the mailbag! The Tumble inbox is filling up with questions, and Marshall scrambles to answer them while Lindsay relaxes with a glass of lemonade. We find out why rainbows don’t fall down, why naked mole rats are naked, whether you can sneeze with your eyes open, why we have dreams, and how scientists studied tickling with a tickle robot.

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Thanks for listening, and stay tuned for more stories of science discovery.