The Canada Industrial Relations Board has ordered employees of the country's two largest railways back to work, after a bitter labour dispute and an unprecedented work shut down. Also: Ukraine marks its third Independence day since Russia's invasion, as battles continue on the frontlines with no end in sight. Plus: We'll tell you how climate change is affecting the practice of forensic science - and how those changes could impact our legal system.

If there was optimism that the rail labour dispute was over, it was short lived. Despite the federal government ordering binding arbitration, a new wrench was thrown into the mix. The union representing CN workers issued a strike notice, leaving many to wonder what will happen next.

Also: With national political conventions now over, Republicans and Democrats are trying to hone their political messages as the campaign enters a new phase. Democrats are trying to keep their momentum alive, while Republicans work to win back the spotlight.

Plus: A new study of pre-packaged food for babies and toddlers suggests that many of those products do not meet international standards for nutrition. And some could even have an impact on a child’s development.

The federal government is acting to get the trains moving again. Two railway companies locked out 9300 hundred employees early this morning. With a substantial economic impact, the federal labour minister has ordered both sides to arbitration.

And: The federal government is restricting the sale of flavoured nicotine pouches - starting next week. National health groups have been raising serious concerns about the risk to teenagers.

Also: Kamala Harris takes the spotlight on the last night of the Democratic National Convention in Chicago. Her speech is an opportunity to define her vision and motivate voters.

Plus…. The star power political parties rely on, pigs on solar farms, violence in libraries and more.

Canada's two major freight railroads are on the verge of shutting down. Without a deal by midnight, workers at Canadian National and Canadian Pacific Kansas City will be locked out, or go on strike. People in all sorts of sectors, from farmers, to commuters, to those in the chemical industry, are preparing for disruptions.

And: The school year starts next week - but Quebec says it is short thousands of teachers. The province says there are about 20,000 more students enrolled compared to last year. Teachers say they need better working conditions and more support in the classroom.

Also: Two months after a large cyanide spill at the Victoria gold mine in Yukon, the company is in receivership and there is no plan to clean up the toxins. Residents fear the damage to the land and water will be permanent.

Plus… Harm-reduction advocates say Ontario's decision to close 10 supervised drug consumption sites is a "deadly mistake", Democrats officially introduce Tim Walz, and more.

Canada’s two major railways could come to a halt in less than two days. Canadian National Railway and Canadian Pacific-Kansas City are threatening to lock out their 9300 workers and the union is prepared to strike at midnight tomorrow. We take a look at the potential impacts and Ottawa’s efforts to avoid them.

And: Kamala Harris holds a major campaign event in Wisconsin, just one day after celebrating her nomination at the Democratic National Convention in Chicago. Former president Barack Obama is expected to give a speech during day two of the DNC.

Also: Taylor Swift fans are accusing Donald Trump of spreading misinformation after he reposted an AI-generated image of the superstar endorsing his campaign. She did no such thing, and the Republican presidential candidate could face yet more legal troubles as a result.

Plus… A Ukrainian soldier on the incursion in Russia, opposition to the latest senate appointment, and more.

Democrats kick off their national convention in Chicago. President Joe Biden speaks tonight to endorse Kamala Harris as the party’s choice. The four-day convention is also drawing thousands of protesters - concerned about the war in Gaza, and many opposed to the administration's support for Israel. Also: U.S. Secretary of State Antony Blinken says Israel has accepted a bridging proposal for a cease-fire and hostage release in Gaza. Blinken says it’s time for Hamas to do the same but events on the ground suggest the war is far from over. Plus: Phil Donahue has died. His long-running syndicated talk show didn't shy away from provocative social and political issues. Its success paved the way for other daytime hosts, such as Oprah Winfrey. And… rescuers in Italy search for six people missing from a yacht that sank in a sudden storm, rebuilding underway in Jasper, a new federal political party, and more. 

Vice President Kamala Harris will officially accept her party's nomination this week, as the Democratic National Convention kicks off in Chicago on Monday. Also: Hurricane Ernesto is making its way towards Atlantic Canada. While the storm is expected to stay offshore, officials are warning residents not to let their guard down. Plus: We'll take you to Kenya, where the country's youngest citizens have been taking on the government in anti-corruption protests. We also have an update on a ceasefire deal between Israel and Hamas, and much more.

After 25 years without a single confirmed case, Polio has re-emerged in Gaza. The discovery comes as officials confirm they have detected the disease in an infant. The U-N is calling for a pause in the fighting, so the population can be vaccinated before before the virus spreads. Also: As the city of Jakarta sinks, Indonesia is building a new capital. But the plan to do that is driving the country into a financial hole. Plus: One of Canada's oldest radio stations, 900 CHML in Hamilton, Ontario has gone silent - another blow to the local news business in Canada. We also have updates on people returning to Jasper, doctors protesting in India, and much more.

As water gushed from a pipe in Montreal’s downtown, officials scrambled to figure out what caused the flooding. The geyser nearly 10 metres high to flood hundreds of homes, and sparked a boil water advisory for the entire east end. And: Jasper residents are allowed to go home more than three weeks after a wildfire burned down a third of the town. Some people returned to intact homes, while others have nothing left. Plus: From silent ones, to ones held in bars to ones that have cooking… there's as much diversity in book clubs these days as there is in books. Also: Kamala Harris’ economic plan, a CBC News investigation into a terror suspect’s past, and more.

Police have laid charges in the death of actor Matthew Perry. Five people, including two doctors, are accused in connection with his ketamine overdose death last year. Prosecutors in California say they uncovered a “broad, underground criminal network” that included the star's personal assistant.

And: Olympic breakdancer Rachel Gunn says she’s devastated by the hate she's received following her appearance in Paris. A petition demanding an apology from the Australian Olympic Committee for her performance has been taken down - after the organization called it “vexatious, misleading and bullying."

Plus: The Saskatchewan town of Moosomin - population 3,300 - has bucked the trend of declining small towns by offering $30,000 dollars to anyone who wants to build housing. The result? A building and population boom.

Also: Taylor Swift London security, bad air quality in Edmonton, flood clean up, National Acadian Day and more.