Posts

How do we know how old the universe is? Expansion, the cosmic background and stars

The figure usually quoted for the age of the universe is abo…

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How does the body regulate temperature? Sweating, shivering and fever

Whether you step out into a frosty morning or sit in a hot b…

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How do tides work? The Moon, the Sun and spring and neap tides

Twice a day, along most coasts, the sea creeps up the beach…

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How do vaccines train the immune system? Antibodies, memory cells and boosters

A vaccine is a rehearsal. It shows the immune system what a…

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Why do we dream? What sleep science does and doesn't know

Everyone dreams, including people who swear they never do. Y…

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Why is the sky blue? Everyday science on seasons, floating ice, salty seas and lightning

Some of the best science questions are the ones children ask…

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Ask the 'why' question you never got a good answer to

Why is the sky blue but sunsets red? How does a vaccine trai…

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