This timeline of science and philosophy is a distinct but contiguous timeline for the Superpowers alternate history. Discoveries from before the points of divergence are described before presenting a categorization of discoveries from the last two millennia. Region of origin is indicated in parentheses: Roman Empire (R), Maya Conglomerate (M), Far East (E), or Islamic world (C). Only novel discoveries or inventions are mentioned, leaving the dissemination of ideas to the imagination of the reader unless the idea is important enough to events to merit describing its spread.