All astronomical bodies, from moons and planets up to galaxies, spin and have orbits. Spin is also a key characteristic of subatomic particles. Yet in our human world, we are relatively static. Why is spin unimportant for us, but at other levels it is all-pervasive? How do the laws of physics make our biosphere so special?
Rob Francis, Bishop鈥檚 Stortford, Herts, UK
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