Can a 75-year old health insurer spark some radical innovation on the local startup scene? That's the goal of a new partnership between Blue Cross Blue Shield of Massachusetts and Healthbox, which runs a three-month "accelerator" program for entrepreneurs working on new products and services for the healthcare industry. The new program starts today, with 10 teams taking up residence in Kendall Square — in the same office building where DogPatch Labs and TechStars Boston are based — and wraps up with an "Innovation Day" in November, when they'll show off their progress.