This week’s new questions
Is there such a thing as an olfactory illusion, and what forces make a particle of fluid start spiralling down a pipe instead of flowing smoothly?
Regulars
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Is there such a thing as an olfactory illusion, and what forces make a particle of fluid start spiralling down a pipe instead of flowing smoothly?
Readers debate how the introduction of bicycles and trains will have led to less closely related prospective partners for our ancestors – and consider various royal dynasties from this perspective