"I don't know how many people you've lost to cancer, but it's too damn many," says Bill Buckley.

Over the past four years, the 76-year-old Buckley has thrown much of his wealth - recently estimated by the NBR Rich List at $110 million - into creating a new company, Neutron Therapeutics, which aims to treat deadly tumours using Boron Neutron Capture Therapy (BNCT). In other words, a neutron beam that zaps a tumour cell-by-cell.

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