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What makes something beautiful?

Garry Trethewey,

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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