Sade Burrell of San Diego is defying the odds. She grew up in San Diego’s foster care system. She’s a single mom. And now, she’s got a doctoral degree from UCSD. MORE: https://www.cbs8.com/article/news/local/former-foster-child-mother-of-two-graduates-with-phd/509-f954e077-a93c-486e-95e1-f1af5bc34e30