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Why aren't humans more hairy? How does a diesel engine work and what exactly is Dr Karl's new planet. That's all on the agenda this week for Dr Karl and Dr Rhod.
By BBC Radio 5 Live4.5
107107 ratings
Why aren't humans more hairy? How does a diesel engine work and what exactly is Dr Karl's new planet. That's all on the agenda this week for Dr Karl and Dr Rhod.

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