What causes double rainbows?

09 November 2018
Presented by Chris Smith.

What is deja vu? Why do certain magnets attract? Why do tea stains form in a ring? Can you scientifically work out someone's date of birth? How does mercury and lead stay in your body? Do mermaids exist? Do balloons defy gravity? What causes a double rainbows? Why does oxidised cholesterol cause heart attacks? Plus the life saving backpack for bees!

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