WARNING: This video contains disturbing content. Viewer discretion is advised. As more gruesome evidence of Russian atrocities emerges from the city of Bucha, Ukrainian President Volodymyr Zelenskyy is questioning the UN's purpose if it won't hold Moscow accountable. The new insight into Russia's chilling plans to erase Ukraine as a country, and the latest round of sanctions from the European Union. In this sixth COVID-19 wave, Canadians are getting new guidance on a fourth vaccine dose. The province that's already outlined details on administering the second booster, and where mask mandates are being extended. With China locking down millions of people to fight a new surge in COVID-19 infections, experts say there are more effective and feasible strategies. Plus, like oil and water: how Canada's climate goals are clashing with new global energy demands. And evolving story: the mysterious reappearance of Charles Darwin's priceless notebooks, two decades after they vanished.