Photo: Max Herman/NurPhoto/Getty Images

25,000 teachers are on strike in Chicago, the country's third-largest school district, and it's keeping about 300,000 students from the classroom, reports the Washington Post.

The big picture: This is the second time in 2019 that teachers in a large school district in the U.S. have gone on strike — "representing a wave of teacher activism that has swept the nation," writes the Post.

  • Teachers in Los Angeles, the nation's second-largest school system, went on strike earlier this year to demand better resources, per the Los Angeles Times.

Why it matters: This strike will be Chicago Mayor Lori Lightfoot's first major mayoral test, notes the Washington Post. The strike has forced her to cancel classes, but she says Chicago cannot afford to fulfill the teachers' requests.

What they're demanding: The teachers are asking for capped class sizes, higher salaries, increased hiring of teacher's assistants and nurses, per the Post.

  • The teachers are also asking Chicago to address the housing crisis as thousands of students are homeless. So in addition to teaching the students, the teachers "often have to ensure their basic needs are being met," according to the Post.

Go deeper: No end in sight for nationwide wave of teacher strikes

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Scoop: Facebook cracks down on political content disguised as local news

Illustration: Eniola Odetunde/Axios

Facebook is rolling out a new policy that will prevent U.S. news publishers with "direct, meaningful ties" to political groups from claiming the news exemption within its political ads authorization process, executives tell Axios.

Why it matters: Since the 2016 election, reporters and researchers have uncovered over 1,200 instances in which political groups use websites disguised as local news outlets to push their point of view to Americans.

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Illustration: Aïda Amer/Axios

Governments around the world, prompted by nationalism, authoritarianism and other forces, are threatening the notion of a single, universal computer network — long the defining characteristic of the internet.

The big picture: Most countries want the internet and the economic and cultural benefits that come with it. Increasingly, though, they want to add their own rules — the internet with an asterisk, if you will. The question is just how many local rules you can make before the network's universality disappears.

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Illustration: Sarah Grillo/Axios

Left-wing climate activists don't want Joe Biden getting advice from people with credentials they don't like — and they're increasingly going public with their campaign.

Why it matters: Nobody is confusing Biden with President Trump, and his climate platform goes much further than anything contemplated in the Obama years.