Canadians have one of the highest rates of cannabis use in the world, and a relaxation of marijuana laws is now an election issue. So, is cannabis really 'infinitely worse' than tobacco, as Conservative Leader Stephen Harper has claimed?
Arthur McDonald, a professor emeritus at Queen's University in Kingston, Ont., and the director of the Sudbury Neutrino Observatory in northern Ontario, is a co-winner of this year's 2015 Nobel Prize for Physics.
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