David interviews science communicator and media personality Dan Riskin about "hearing" the temperature of water, and the science (or lack thereof) of whether stand-up comedians are a psychological mess. Then, sexual health and consent educator Samantha Bitty discusses dating (read: horrible dating) and ghosting. Finally, UK-based foreign correspondent Tony Five listens to David's half-baked theory on how being pooped on birds came to be considered good luck. Tony asks David about his childhood. David sings.

(BONUS: watch Why It Was Almost Impossible to Make the Blue LED)

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