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Curious Cases Series 5 Episodes Episode guide
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The Forgetful Child
Why don't we remember the first few years of our lives?
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The Astronomical Balloon
'How far up can a helium balloon go? Could it go out to space?' asks Juliet Gok, aged 9.
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A Code in Blood
Why do we have different blood types? Drs Rutherford and Fry investigate.
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The World That Turns
'Why does the Earth spin?' asks Joe Wills from Accra in Ghana.
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The Broken Stool
How much does the bacteria inside my body weigh?