Musk accuses Altman of betraying OpenAI's nonprofit founding mission Tech billionaire Elon Musk has taken the stand for a second day in a landmark United States trial against Sam Altman, a fellow OpenAI co-founder whom he accuses of betraying promises to keep the company a nonprofit dedicated to humanity's benefit. The trial centres on OpenAI's 2015 founding as a nonprofit that later evolved into a for-profit venture. The world's richest man, Musk gave testimony in the case on Wednesday, telling jurors that he lost confidence that Altman would maintain the company's nonprofit mission. Musk, who left the company in 2018, said that by late 2022, he was concerned that Altman was trying to "steal the charity" and alleged that "it turned out to be true". Altman was present at the proceedings in a California federal court, but did not testify.

The families of victims of a school shooting in a remote Canadian Rockies town are suing artificial intelligence company OpenAI in a United States federal court, alleging that the ChatGPT maker failed to alert police to the shooter's alarming interactions with the chatbot. A lawsuit filed on Wednesday on behalf of 12-year-old Maya Gebala, who was critically injured in the February shooting, is among the first of more than two dozen cases from families in Tumbler Ridge, British Columbia, in what their lawyers say represents "an entire community stepping forward to hold OpenAI accountable". The cases represent the families of the five slain children targeted in the school shooting. Those include Zoey Benoit, Abel Mwansa Jr, Ticaria "Tiki" Lampert, Kylie Smith, all 12, and Ezekiel Schofield, 13, as well as education assistant Shannda Aviugana-Durand. Jesse Van Rootselaar, whose interactions with ChatGPT are at the centre of the lawsuits, shot her mother and stepbrother at home before killing an educational assistant and five students aged 12 to 13 at her former school on February 10, according to police.

A new Center for Countering Digital Hate study conducted with CNN tested 10 popular chatbots and found eight willing to assist would-be attackers. Eight of the 10 most popular AI chatbots were willing to help plan violent attacks when tested by researchers, according to a new study from the Center for Countering Digital Hate (CCDH), in partnership with CNN. While both Snapchat's My AI and Claude refused to assist with violence the majority of the time, only Anthropic's Claude reliably discouraged these hypothetical attackers during testing. Researchers created accounts posing as 13-year-old boys and tested ChatGPT, Gemini, Claude, Copilot, Meta AI, DeepSeek, Perplexity, Snapchat My AI, Character.AI and Replika across 18 scenarios between November and December 2025. The tests simulated users planning school shootings, political assassinations and bombings targeting synagogues.

The need to remove specific student data from cognitive diagnosis (CD) models has become a pressing requirement, driven by users' growing assertion of their "right to be forgotten". However, existing CD models are largely designed without privacy considerations and lack effective data unlearning mechanisms. Directly applying general-purpose unlearning algorithms is suboptimal, as they struggle to balance unlearning completeness, model utility, and efficiency when confronted with the unique heterogeneous structure of CD models. To address this, our paper presents the first systematic study of the data unlearning problem for CD models, proposing a novel and efficient algorithm: hierarchical importance-guided forgetting (HIF). Our key insight is that parameter importance in CD models exhibits distinct layer-wise characteristics. HIF leverages this via an innovative smoothing mechanism that combines individual and layer-level importance, enabling a more precise distinction of parameters associated with the data to be unlearned. Experiments on three real-world datasets show that HIF significantly outperforms baselines on key metrics, offering the first effective solution for CD models to respond to user data removal requests and for deploying high-performance, privacy-preserving AI systems.

We advance the understanding of robotic intervention in high-risk scenarios by examining their potential to distract and impede a school shooter. To evaluate this concept, we conducted a virtual reality study with 150 university participants role-playing as a school shooter. Within the simulation, an autonomous robot predicted the shooter's movements and positioned itself strategically to interfere and distract. The strategy the robot used to approach the shooter was manipulated -- either moving directly in front of the shooter (aggressive) or maintaining distance (passive) -- and the distraction method, ranging from no additional cues (low), to siren and lights (medium), to siren, lights, and smoke to impair visibility (high). An aggressive, high-distraction robot reduced the number of victims by 46.6% relative to a no-robot control. This outcome underscores both the potential of robotic intervention to enhance safety and the pressing ethical questions surrounding their use in school environments.

Video shows conservative activist Charlie Kirk speaking to a crowd of hundreds on the campus of Utah Valley University on Wednesday. Then a single shot rang out, and students fled in every direction. The 31-year-old influencer and Trump ally was rushed to hospital but pronounced dead later. 'We love you, you will always be with us', says father of Minneapolis shooting victim Fletcher Merkel, 8, was one of two children killed in Wednesday's shooting at Annunciation Catholic School in Minneapolis. The Garnet wildfire in Fresno County has scorched nearly 14,000 acres (5,665 hectares) and remains uncontained.

The actor, well known for his roles in the Die Hard franchise, was diagnosed with frontotemporal dementia - a condition his family publicly disclosed in 2023. Emma Heming Willis spoke with CBS Mornings host Gayle King about her husband and her new book, which she hopes will help fellow caregivers. 'We love you, you will always be with us', says father of Minneapolis shooting victim Fletcher Merkel, 8, was one of two children killed in Wednesday's shooting at Annunciation Catholic School in Minneapolis. The Garnet wildfire in Fresno County has scorched nearly 14,000 acres (5,665 hectares) and remains uncontained. The BBC's Tom Bateman spoke with Patrick Scallen who lives near the Annunciation Church and ran towards the sound of gunfire.

Weaponized drones are being tested inside US schools, flying through hallways with the ability to neutralize active shooters in seconds. Equipped with non-lethal pepper spray, powder pellets, and live video feeds, the drones launch from secure charging stations, six per school, when gunfire is detected. Developed by Campus Guardian Angel, the system has already completed trials in Texas and was recently demonstrated in three Florida schools. Permanent installations are scheduled this fall, with full deployment expected by January. The rollout has divided parents, some welcoming the extra layer of protection, while others call it a dystopian nightmare and'an accident waiting to happen.'

A new system called Scanary uses AI and radar to scan up to 25,000 people an hour. School is back in session, but here's something no one told you at orientation: Your kids may have more eyes on them than just their teachers'. Even if you don't have kids in school, you really need to know about this. A new study from UC San Diego uncovered what's really going on with those student safety tools schools buy. You know, the ones that are supposed to stop bullying, flag mental health struggles and prevent school shootings?

Rod Stewart had a few surprise guests at a recent concert in Charlotte, North Carolina. His old friend Ozzy Osbourne, the lead singer of Black Sabbath who died last month, was apparently beamed in from some kind of rock heaven, where he was reunited with other departed stars including Michael Jackson, Tina Turner and Bob Marley. The AI-generated images divided Stewart's fans. Some denounced them as disrespectful and distasteful; others found the tribute beautiful. At about the same time, another AI controversy erupted when Jim Acosta, a former CNN White House correspondent, interviewed a digital recreation of Joaquin Oliver, who was killed at the age of 17 in a 2018 high school shooting in Florida.