A new technique based on machine learning and stem cells may lead to personalized testing for hazardous chemicals and make toxin testing on animals a thing of the past. Dubbed ‘forever chemicals’ ...

Follow Boston.com on Instagram (Opens in a New Tab) Follow Boston.com on Twitter (Opens in a New Tab) Like Boston.com on Facebook (Opens in a New Tab) ...

TONIGHT: Cloudy with some times of showers or drizzle. Low: 46 SUNDAY: Cloudy and cool again; showers likely, mainly in the morning. High: 54 SUNDAY NIGHT: Continued cloudy with a bit of rain likely ...