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Why does quantum teleportation still need an ordinary message?

Quantum teleportation sounds like a way around the speed of light, yet the receiver still has to wait for an ordinary message. What travels is a quantum state, using shared entanglement and information sent through a conventional channel.

5–7 min

Questions you could explore

  • What does the receiver lack before that message arrives?

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Physics

Why metal can feel colder than wood

A metal handle and a wooden tabletop can share a room temperature yet feel quite different. The clue lies in the exchange of heat between your hand and the surface, which is not the same thing as measuring temperature.

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Why metal can feel colder than wood

Physics5–7 minA metal handle and a wooden tabletop can share a room temperature yet feel quite different. The clue lies in the exchange of heat between your hand and the surface, which is not the same thing as measuring temperature.

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How can headphones fight noise with more sound?

A steady engine hum can fade when noise cancellation switches on, while a nearby voice remains noticeable. The electronics and the physical ear covering do different jobs, and neither makes every sound disappear.

4–5 min

How can headphones fight noise with more sound?

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Physics

How can a ship made of steel float?

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3–5 min

How can a ship made of steel float?

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