ESPN's NBA Basketball Power Index (BPI) is a measure of team strength developed by the ESPN Analytics team. BPI is meant to be the best predictor of a team's performance for the rest of the season.

Gyaltsan (center) teaches students how to use his multiplication chart at a primary school in Lhasa, Tibet autonomous region. [Photo by PALDEN NYIMA/CHINA DAILY] Gyaltsan, a Tibetan man from Nyingchi ...