Scientists Create Mice With Partly Human Brains for Disease Research

In laboratories across the United States, scientists have achieved something that blurs one of biology's oldest boundaries: the creation of living mice whose brains contain human neural tissue. Using a technique called xenocortication, researchers implant human-derived brain organoids into mouse brains to study neurological diseases like Alzheimer's and autism in ways no petri dish or simulation can replicate. The breakthrough is as promising as it is unsettling — a reminder that science's most powerful tools often arrive before the wisdom needed to wield them.