“HFO is unique when it’s accidentally spilled into marine environment in that it emulsifies on the ocean surface,” Andrew Dumbrille said. “And that emulsification is like a mayonnaise, which stays on the surface for many days, weeks, some people say months, and is extremely difficult to clean up.”

Prof. Mark Kleiman says Canada should not leave the marketing and sale of cannabis to profit-making entities.

Professor Peter McKenna explains Canada's historical connection to Cuba and why it is important to honour it for the future.

Prof. Damon Matthews says the countdown clock is designed to motivate action on climate change.

Hugh Segal talks about his latest book, 'Two Freedoms: Canada's Global Future'

Veteran pilot Jock Williams says more should be done to control drones flying in Canada.

Prof. Martin Pyle offers tips on how to detect fake reviews of services.

Hilliard MacBeth, a financial portfolio manager, and author of 'When the Bubble Bursts' is cautioning Canadians about buying into the high real estate markets in the Toronto and Vancouver regions.

David Halton as foreign correspondent for the CBC in Washington

Prof. Miriam Beauchamp wants parents of preschoolers with concussion to be aware the injury can adversely affect their interactions.