Is the volume of gas at top of a beer bottle the same for all beers?
One reader just happens to be a brewer, and explains all about the mysteries of that seemingly empty space in a bottle of beer that separates your tipple from the cap
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This week’s new questions
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Physics
Hypnotic art has its roots in the terrifying reality of nuclear bombs
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Mathematics
How breaking the rules of tic-tac-toe makes it way more fun
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Comment
Is this the most glorious retraction notice a journal has ever made?
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Tom Gauld on a Grand Unified Conspiracy Theory
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Twisteddoodles leans into Tolkien
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Space
Eerie image of a space-bound rocket among photo contest finalists
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Space
How to tell a planet from a star – and one planet from another
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What does the angle of a spirit level mean relative to Earth?
Our readers explain that spirit (or bubble) levels indicate the direction of Earth's gravitational pull, though local variations are unlikely to make a practical difference for putting up shelves
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Would a powerful solar storm knock out electronics in planes?
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Is it possible to have a high-tech society without iron? Part 2
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This week’s new questions
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Comment
Scientists want to poke me where, with a what?
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