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Difficulty: Medium

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Puzzle 1491

It burns no coal, no oil, no nuclear fuels and has no need for electricity.

It uses no man made explosions.

Yet it is far hotter than all ovens and fires and furnaces.

What is it?

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[Ref: ZERS]  



Difficulty: Medium

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Puzzle 1492

You have the misfortune to own an unreliable clock. This one gains exactly 22 minutes every hour. It is now showing 10:15am and you know that is was correct at midnight, when you set it. The clock stopped three hours ago, what is the correct time now?

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[Ref: ZKTZ] © Kevin Stone 



Difficulty: Medium

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Puzzle 1493

Can you find the two smallest non-zero whole numbers such that the difference of their squares is a cube and the difference of their cubes is a square?

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[Ref: ZYTH]  



Difficulty: Easy

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Puzzle 1494

I have 55p in my pocket. Can you tell me what two coins they are if I say that one of them is not a 5p coin?

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[Ref: ZWVH]  



Difficulty: Easy

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Puzzle 1495

What is the shortest word in the English language?

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[Ref: ZYRU]  


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