Prime Minister Justin Trudeau has been caught on a hot microphone. Why he says U.S. President Donald Trump's threat to annex Canada is no joke. How new polls say Canadians are souring on their southern neighbours. We'll visit a border community where tariffs are the talk of the town. The deadly pileup involving dozens of vehicles on a snowy Ontario highway. And answering an age-old question: what a 4-billion-year-old asteroid reveals about how life on Earth began.