Sometimes science throws up the unexpected. When a team of researchers set out to model river erosion in Canada's High Arctic, they did not expect the findings to defy common sense.

The Canadian prime minister will have the sell his gamble that walking away from talks with the White House will be worth the consequences.

The latest escalation comes after last-minute changes derailed weeks of negotiations between the neighboring countries.

U.S.-Canada tariff deal falls through, NYC cracks down on wage theft, plus Grace Potter is back. All this and more on "CBS Saturday Morning."