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Ask the 'why' question you never got a good answer to
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Why is the sky blue? Everyday science on seasons, floating ice, salty seas and lightning
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Why do we dream? What sleep science does and doesn't know
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How do vaccines train the immune system? Antibodies, memory cells and boosters
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How do tides work? The Moon, the Sun and spring and neap tides
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How does the body regulate temperature? Sweating, shivering and fever
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How do we know how old the universe is? Expansion, the cosmic background and stars
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