Tech billionaires have raised more than $340m to defeat Prop 40, a one-time 5% wealth tax that will fund healthcare and education

Tech billionaires have been dumping hundreds of millions of dollars into the fight against a wealth tax in California. They’ve raised more than $340m, and the campaign they’re funding is spending more than $1m a day to defeat the measure, according to state financial disclosures.

With the election less than a month away, those funds are being spent at a stepped-up pace. During the first 19 days of September, according to the most recent campaign filings, the opposition campaign plowed through at least $21.2m to fight the billionaire tax – surpassing $1m per day. Voters are being inundated with robotexts, mailers and advertisements that warn a tax on billionaires would “expose all Californians to higher taxes”, as one ad reads.

From the FBI to local police departments, US authorities are increasingly warning of would-be terrorists using chatbots to plan attacks and anti-AI extremist threats

In May 2025, a 25-year-old man detonated a car bomb outside a Palm Springs fertility clinic, killing himself and injuring four others. For many, it was a wake-up call about the threats to reproductive care facilities. For the FBI, though, it was also a sign of what the agency had feared for years: bad actors were using generative AI to plan and execute terror plots.

The suspect used an unnamed generative AI tool that failed to detect his request for bomb-making instructions, law enforcement officers wrote in a previously unreported document reviewed by the Guardian. The privacy of his conversation with the AI chatbot hindered alerting police that someone was looking up how to make a bomb, according to the memo.

How extremists could use AI to devise attacks and recruit new members

How AI could be used to disseminate and produce everything from deepfakes to election misinformation and child sexual abuse material (CSAM)

How people seeking information on how to make weaponry or bombs could use AI to circumvent police detection

How to ensure that officers could take advantage of AI tools in policing, for things like social media monitoring, while managing public concern over the use of these tools

Monitoring social media for opposition to AI and potential extremist attacks on datacenters

The subversive bacchanal for San Francisco’s eccentric underground is ageing out amid an influx of the super-rich

Burning Man, the infamous arts festival in the Nevada desert, turned 40 this year, and it’s showing some distinct signs of middle age.

It’s not just the tech billionaires who show up to party, the chartered flights straight to the desert or the HBO documentary about behind-the-scenes power struggles. The tens of thousands of people who assemble each year to create a tent city in the wilderness appear to be growing older, and it doesn’t seem that they’re being replaced by as many younger “burners”, as festival participants are called.

The passport-size iPhone Duo serves as the first big test for John Ternus, who took over from Tim Cook last week

Apple has unveiled the iPhone Duo, the company’s first foldable phone and the most significant change to the iPhone since the smartphone’s introduction in 2007.

The nearly $2,000 device takes inspiration from iPads’ wide screens and combines them with the portability and camera features of iPhones. When opened, it is the company’s largest phone display and thinnest phone. The Duo opens and closes like a passport to double its screen size.

Also: OpenAI CEO Sam Altman expressed his surprising sympathy over the construction of datacenters across the country

Hello, and welcome to TechScape. I’m Blake Montgomery, US tech editor at the Guardian, writing to you from a sunny park in New York City, which was supposed to endure rain all weekend but in fact delivered the best weather of the year.

‘We are hitting a different chapter’: OpenAI leader warns of threat of ‘persistent’ AI cyber-attacks

OpenAI announces slowing pace of development after hack by rogue agent

OpenAI launches ChatGPT for Teens with stronger safeguards

‘Digging the grave of my profession’: the Hollywood creatives training AI to do their jobs

Will AI give you the job? Automated hiring tools spark discrimination and secrecy lawsuits

After more than 15 years of laptops in the classroom, do Australian schools need a rethink?

Crypto bank part-owned by Trump family offers depositors way to ‘gain favor’ with White House, experts say

Did someone wearing Meta Glasses film you today? Are you sure?

The mission of the Flock app is quietly subversive: to encourage users to ditch their screens and explore the wonderful world of birding

On a brilliantly bright afternoon in his gallery and studio in Bolinas, a small town on the northern California coast, Keith Hansen was putting the finishing touches on a watercolor of an almost improbably flamboyant painted bunting.

With an ultra-fine sable brush, he made a few intricate additions to the cobalt blue plumage on the bunting’s head, and, satisfied with his work, slipped the watercolor into a stout binder that every few days welcomes a new addition.

Wealth tax criticized by billionaires and Gavin Newsom would levy a one-time 5% tax on residents worth over $1bn

A popular proposal in California to impose a wealth tax on billionaires has gained enough signatures to qualify for the ballot in November, state officials announced on Wednesday.

The news is set to intensify an already heated debate around the tax, which has pitted tech moguls and the state’s governor, Gavin Newsom, against the labor union backing the measure.

While many US city councils have passed moratoriums, Monterey Park is first where residents have voted on a ban

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Residents in Monterey Park, California, became the first in the US to vote on a permanent ban on datacenters on Tuesday, and early results indicate a resounding victory for the prohibition.

While many cities and counties have already passed temporary or indefinite moratoriums via their local governments, Monterey Park would be the first to do so through a ballot initiative.