What makes something beautiful?
Garry Trethewey,
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Cherryville, South Australia
Could there be a universe larger than ours, such that ours is a subatomic particle by its standards? And is it possible that, within the particles we know of, there are smaller universes?
William Wood,
Charlbury, Oxfordshire, UK
To answer this question – or ask a new one – email lastword@newscientist.com.
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