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Researchers develop light-activated tattoo ink that can be switched on and off

Scientists at the University of Colorado Boulder, led by Carson Bruns, created a tattoo ink system called PhotoTat that uses photochromic dyes in protective nanoparticles to appear or vanish depending on light exposure. A UV LED activates the colors within seconds, and they fade under bright sunlight, while the pigment itself stays permanently embedded in the skin. The research was published October 9 in the journal Matter & Light.

Sorkin's 'The Social Reckoning' opens to just $5.5M domestically

Aaron Sorkin's follow-up to 'The Social Network' debuted to an estimated $5.5 million at the domestic box office this weekend, falling short of the studio's own projection of $7-8 million. The film depicts whistleblower Frances Haugen's leak of internal Facebook documents, in contrast to the earlier film's $22 million opening and $97 million domestic total.

GoKawiil chronicles hunt for identity of Toftwood Male Voice Choir vinyl pressing

A writer for GoKawiil recounts buying an obscure vinyl record, 'Christ Liveth In Me' by the Toftwood Male Voice Choir, on March 11, 2017, as part of a long-running habit of collecting rare and unusual vinyl and vintage equipment. The purchase, made during a broader search for 1950s-60s demonstration and sound-effects records, turned into a personal investigation to trace the choir's origins and history.

AI researcher Andrej Karpathy says awareness of LLM capability is splitting into four tiers

Andrej Karpathy argues that public understanding of large language models' capabilities is diverging sharply rather than converging. He outlines a rough tier system: roughly 75% of people have barely used LLMs, 20% use free chatbots casually, about 0.2% of professionals in coding and math see agents completing weeks of work in a prompt, and an estimated 5,000 people with internal access to frontier systems are reportedly seeing swarms of agents handle multi-week software projects, cyberattacks and research-level math.

NixOS project highlights VEX statements to cut false-positive CVE alerts

A write-up on NixOS describes how generic SBOM-based vulnerability scans flag CVEs in dependencies even when the vulnerable code path isn't actually used, creating noise for maintainers and security teams. It argues that VEX (Vulnerability Exploitability eXchange) documents, which state whether a product is truly exposed to a given CVE, can be generated and applied effectively within Nix's build system to filter out irrelevant findings.

Entrepreneur op-ed outlines five-step framework to curb wasted product development spending

An Entrepreneur contributor argues that startups most often waste money not through bad hires or launches but by building products without real validation of customer demand. The piece lays out five principles for product teams, starting with treating internal processes like a product to be prototyped and tested with a small cross-functional group before scaling up.

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