What happens if I shine a torch, moving at the speed of light? Part 2
One readers grapples with the counter-intuitive outcomes of this question, just like Einstein did
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This week鈥檚 new questions
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In which direction in the sky did the big bang take place?
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Humans have 鈥済ood bacteria鈥�, but what about 鈥済ood viruses鈥�?
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What鈥檚 the best angle for a hosepipe to spray water furthest? (Part 2)
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This week鈥檚 new questions
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Does a latte cool faster than a cappuccino?
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Why do loose screws only get looser and not the other way round?
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How fast would you have to travel to be able to run on water? (part 2)
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This week鈥檚 new questions
Could a rope be made long, light and strong enough for a tug-of-war over the 42 kilometres between Dover, UK, and Calais, France? And why do speakers at public events wave their hands around so much?
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If the house always wins, how do professional gamblers make a living?
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Is it theoretically possible for our memory to become full?
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This week鈥檚 new questions
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Why are many people squeamish about the sight of blood?
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