Students who were in the class at the University of Waterloo said the assailant entered the classroom and started stabbing people after speaking with the professor. Source

More than a dozen people across Texas and Louisiana have suffered heat-related deaths in recent days, as extreme temperatures are forecast to continue. And smoke from Canada’s wildfires is drifting south to the U.S. again. Michelle Miller has the latest from New Orleans. Source

Ukraine’s national security chief, Oleksiy Danilov, claims Wagner Group’s leader had the support of 14 senior Russian military officers during his mercenary group’s uprising in Russia over the weekend. CBS News foreign correspondent Ian Lee is in Kyiv with more. Source

Chief Justice John Roberts authored the majority opinion. Source

Some NFL players are unclear on the league’s gambling policy as multiple players face punishment for potential violations, according to Kalyn Kahler, senior NFL writer for The Athletic. Kahler spoke with players about the rules and joined CBS News to talk about what they told her. Source

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A murder investigation is underway and the local police chief has said the use of a weapon in the incident was not justified. Source

We found the best deals on Apple iPads and more Apple tech ahead of Amazon Prime Day 2023. Source

CBS News’ review found the people arrested include an Iowa man who was accused of carrying a gun in a bag attached to the baby stroller. Source

At a research lab in Alabama, scientists try to perfect what some see as a powerful tool in the fight against climate change. Others think carbon capture technology is a dangerous distraction and a waste of money. Senior national and environmental correspondent Ben Tracy reports from Wilsonville, Alabama. Source