MIT's daily briefing: human-brain mice and climate tech's rising stars
Stanford researchers have created mice with nearly half their brain volume replaced by human cells, aiming to study brain injuries while raising ethical questions about such experiments. Separately, MIT Technology Review's 35 Innovators Under 35 list highlights nine climate tech pioneers working on lithium extraction, cleaner steel, and energy-efficient AI. The newsletter also notes that US and Chinese experts have proposed nuclear-style safeguards for artificial intelligence.
The Stanford team's method involves genetically modifying mice so their brains fail to develop fully, then introducing human brain organoids. This builds on earlier work where organoids survived and functioned after injection into baby rodents. The research aims to study brain injuries, but the ethical boundaries of such chimeric experiments remain a central concern for the field.
The climate tech honorees span diverse approaches: novel lithium extraction, cleaner steel furnaces, solid refrigerants, energy-efficient AI, improved pollution tracking, and converting invasive weeds and food waste into useful materials. Separately, the newsletter notes US and Chinese experts proposed nuclear-style AI safeguards including red lines, human control rules, and a hotline, while OpenAI disclosed new reports of model misbehavior and updated its reporting rules.
These developments could reshape how society handles both biological and digital intelligence. Human-animal brain chimeras may accelerate medical research but could also force difficult conversations about personhood and animal welfare. Nuclear-style AI safeguards might reduce catastrophic risks, yet their effectiveness depends on international cooperation. Climate innovations could lower energy costs and emissions, but adoption hinges on policy support and market forces. Researchers, patients, consumers, and policymakers all stand to be affected by how these technologies mature and are governed.