Controversies in Science

Controversies:
 * /Water fluoridation/
 * /Was there a mitochondrial Eve?/
 * /What killed the dinosaurs/?
 * /RNA world vs metabolism first/
 * /Are humans causing global warming/?
 * nuclear power greener?
 * recycling
 * big bang
 * panspermia
 * LHC black hole risk?

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