Puddle Theory
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You ask why. We go and find out.

A weekly science podcast for curious grown-ups. Every episode starts with one listener’s question and ends with an answer, a scientist who knows, and usually a tangent.

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Raindrops landing on dark water, each making a ring
Episode 118 · out Tuesday Why does rain smell like that?
12:4041:15

From the card catalogue

Every episode is filed like a library card, under the shelf number where you’d find the answer. Pull one out and press play.

  • 551.57 PETEp. 118

    Why does rain smell like that?

    Petrichor, soil bacteria and a chemical your nose can find at five parts per trillion.

    Asked by Noor, Sheffield · 41 min
  • 595.44 SPIEp. 117

    Do spiders get dizzy?

    Eight eyes, no inner ear, and a very patient arachnologist.

    Asked by Theo, age 9 · 36 min
  • 536.42 ICEEp. 116

    Can hot water freeze faster than cold?

    The Mpemba effect, sixty years of arguments, and an experiment in our freezer.

    Asked by Gwen, Cardiff · 44 min
  • 612.82 YAWEp. 115

    Why are yawns contagious?

    Empathy, brain cooling, and why your dog might yawn back.

    Asked by Ade, Leeds · 38 min
  • 523.3 MOOEp. 114

    Why does the moon look huge on the horizon?

    It isn’t bigger. Your brain is lying, and nobody’s quite sure why.

    Asked by Ruth, Inverness · 40 min
  • 641.33 BREEp. 113

    Why does toast always land butter side down?

    Table heights, rotation, and a physicist who dropped toast for a living.

    Asked by Sam, Bristol · 35 min

Two hosts, one of whom knows the answer

One of us is a scientist. The other is a professional asker of follow-up questions. We take turns being the one who knows, depending on the week.

  • Dr. Ines Marlow

    The one with the PhD

    Atmospheric chemist. Will explain anything with a diagram on a napkin.

  • Kofi Brennan

    The one who asks “but why?”

    Former radio producer. Asks the question you were about to shout at your headphones.

Sponsor an episode

Around 28,000 downloads per episode in the first 30 days, mostly in the UK, from listeners who finish 84% of each show. Ads are read by the hosts, in our own words, at three points in the episode.

Pre-rollThe questionMid-rollThe answerPost-roll
0:00~20:00~41:00
  • Pre-roll

    £450 / episode

    30 seconds before the question. Heard by nearly everyone who presses play.

  • Mid-roll

    £700 / episode

    60 seconds at the turn, read by both hosts. Our best-performing slot.

  • Post-roll

    £200 / episode

    30 seconds after the answer, alongside the next week’s question.

Book four episodes and the fifth is free. We only read ads for things one of us would use, and we say so if we wouldn’t. Media kit: sponsor@puddletheory.example.

What do you want to know?

Write it on the card. We read every question, and the ones that make us both say “huh” become episodes. We’ll tell you first if yours is picked.

Or leave us a voicemailCall 020 7946 0183 and ask your question in your own voice. We might play it on the show.
000.00 YOUEp. ???
Roughly which shelf? (optional)

We’ll only say your first name and town on air.

This is a demo site, so your question wasn’t sent anywhere. Puddle Theory is a sample podcast.

Puddle Theory

A listener-question science podcast, new every Tuesday since 2022.

Photos by Alex Dukhanov on Unsplash. Host portraits are illustrations.

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© Puddle Theory. Download figures are 30-day averages from our podcast host. Not medical or safety advice; for that, ask a professional.