After nearly 40 years of marriage, the Canadian actors Paul Gross and Martha Burns say they’re still learning new things about each other. Currently, they’re co-starring as one of theatre’s most dysfunctional married couples, George and Martha, in a new production of Edward Albee’s “Who's Afraid of Virginia Woolf?” at Canadian Stage. Paul and Martha sit down with Tom Power to tell us what it’s like playing this famously toxic couple, and what they’re still learning about each other after all these decades.