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.

Campus Guardian Angel founder and CEO Justin Marston tells'Fox & Friends First' about his Texas-based company's drones designed to make schools safer by confronting an active shooter within seconds. A drone system designed to confront a school shooter within seconds could soon become a frontline defense in classrooms across America. Texas-based Campus Guardian Angel has developed the technology which stations drones inside schools, ready to deploy the moment an emergency alert is triggered. The drones, all controlled remotely at a central operation center in Austin, Texas, are stored in charging boxes inside schools. Once activated, they are designed to fire powder pellets to incapacitate a shooter within 60 seconds and buy time for local law enforcement to arrive at the scene.

Joaquin Oliver was 17 years old when he was shot in the hallway of his high school. An older teenager, expelled some months previously, had opened fire with a high-powered rifle on Valentine's Day in what became America's deadliest high school shooting. Seven years on, Joaquin says he thinks it's important to talk about what happened on that day in Parkland, Florida, "so that we can create a safer future for everyone". But sadly, what happened to Joaquin that day is that he died. The oddly metallic voice speaking to the ex-CNN journalist Jim Acosta in an interview on Substack this week was actually that of a digital ghost: an AI, trained on the teenager's old social media posts at the request of his parents, who are using it to bolster their campaign for tougher gun controls.

Jim Acosta and James Carville speculated whether President Trump will try to rig the 2026 midterms in his favor on "The Jim Acosta Show." Former CNN anchor Jim Acosta was slammed on social media after he posted a clip of his "interview" with an artificially animated avatar of deceased teenager Joaquin Oliver to promote a gun control message on Monday. Working with the gun control group Change the Ref, founded by Oliver's parents, Acosta had a conversation on his Substack with an avatar created by the father of the son, who was killed in the Parkland high school shooting in 2018. Oliver would have turned 25 on Monday. Social media users were shocked by Acosta's "grotesque" interview and slammed the journalist for using the deceased teen's avatar for political content.