Tesla superfan with stage 4 cancer gets surprise visit from Elon Musk

Matthew Chan is a 39-year-old radiologist who lives in Sacramento, Calif., has three children and was recently diagnosed with stage four colon cancer. He started radiation on Jan. 1 and "probably" has less than six months to live, according to a blog post published on Jan. 4 by a friend. That friend, Alan … social experiment …