Dr Karl
Dr Karl on TikTok!
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Triple J Science Questions

Science with Dr Karl
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Next up on the Radio

  • Wednesday 11th February 2026
    9:30 am - 10:00 am

    Dr Karl joins Sarah Cumming on ABC Gold Coast

  • Wednesday 11th February 2026
    10:30 am - 11:00 am

    Dr Karl joins Susan Graham-Ryan on ABC Townsville

  • Wednesday 11th February 2026
    7:00 pm - 7:30 pm

    Dr Karl joins Kelly Higgins-Devine on ABC Brisbane/Queensland

  • Thursday 12th February 2026
    9:30 am - 10:00 am

    Dr Karl joins Rory McClaren on ABC Adelaide


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National Geographic Kids

Why Is It Dark at Night?

Night and dark with Dr Karl… When there is no moon at night, the sky is dark – apart from the light of the stars (let’s ignore the planets). There are thousands of billions of billions of stars, and together they give out a lot of starlight. So why doesn’t the night sky glow as […]

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3D printed organs, muscle memory, that op shop smell

Why do op shops all smell the same? Why can’t we use 3D printers to print organs? Is there any benefit to avoiding gluten?


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A whole lotta black holes, rubbish eating volcanoes and weeing in the ocean

It’s a big black hole celebration! Could one create a new universe? How can we take a photo of one? What would happen to your body if you entered one?

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Can maths predict the future?

Can maths predict the future? What about lotto numbers? Plus, the question that stumped the nation!