Relativity Paradox Sixty Symbols

Trains, tunnels, muons and giant guillotines - strange things happen when you travel close to the speed of light. Even the professional understanding of quantum mechanics is "embarrassing", says cosmologist Sean Carroll. See all our multiverse videos: Dr Tony Padilla here discusses Max Tegmark's four classes of Multiverse.

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• Trains, tunnels, muons and giant guillotines - strange things happen when you travel close to the speed of light.
• Even the professional understanding of quantum mechanics is "embarrassing", says cosmologist Sean Carroll.
• See all our multiverse videos: Dr Tony Padilla here discusses Max Tegmark's four classes of Multiverse.
• A viewer asks our team of physicists and astronomers what part of science they find most confusing?
• Professor Meghan Gray discusses space co-ordinates and what sits at position 0,0 in the sky?

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