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How mathematics stopped being defined by reality — and started to invent new ones Abstraction is a powerful mathematical technique that has influenced everything from quantum theories of gravity to nuclear deterrence theory. But has it gone too far?

How sexual touch triggers pleasant sensations in mice Stimulation of certain neurons triggers activity in the brain’s reward centre.

What time is it on the Moon? Satellite navigation systems for lunar settlements will require local atomic clocks. Scientists are working out what time they will keep.