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Next up on the Radio

  • Wednesday 9th April 2025
    9:30 am - 10:00 am

    Dr Karl joins Sarah Cumming on ABC Gold Coast

  • Wednesday 9th April 2025
    10:30 am - 11:00 am

    Dr Karl joins Susan Graham-Ryan on ABC Townsville

  • Wednesday 9th April 2025
    7:00 pm - 7:30 pm

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

  • Thursday 10th April 2025
    9:30 am - 10:00 am

    Dr Karl joins Rory McClaren on ABC Adelaide


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Great Moments in Science

Balloon popping

When a balloon pops, sometimes it leaves lots of small fragments of rubber, and sometimes it leaves just a couple of larger pieces. What’s going on?

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Sun mirror, essentials oils, vinyl records

How do you get music out of a vinyl record? What would happen if you reflected the sun’s light back at it? Would ants survive without their colony?


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Visual snow, dripping taps, waking up grumpy

What’s ‘visual snow’? Why will a dripping tap wake you up but torrential rain won’t? Why do some people wake up grumpy?

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Corn in poo, Keto diets and cancer causing meats

Why do some farts smell and some don’t? What are so many people developing gluten intolerance? Can you ever be 100% healthy with food? In this food and nutrition special, Dr Karl answers these questions and more with special guests dietitian Dr Kyra Sim and USA nutrition expert Yvette d’Entremont.