Sam Altman's brain-chip venture is exploring the idea of genetically altering brain cells to make better implants. "The company, which has been referred to as Merge Labs, is looking at an approach involving gene therapy that would modify brain cells," reports Bloomberg. "In addition, an ultrasound device would be implanted in the head that could detect and modulate activity in the modified cells." From the report: It's one of a handful of ideas and technologies the company has been exploring, t…