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Dr Karl answers listeners' weird and wonderful questions about the world of science, which include - why woodsmoke can cause asthma? What causes upside down rainbows? And more on the mysteries of black holes.
By BBC Radio 5 Live4.5
107107 ratings
Dr Karl answers listeners' weird and wonderful questions about the world of science, which include - why woodsmoke can cause asthma? What causes upside down rainbows? And more on the mysteries of black holes.

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