This document discusses the highs and lows of open data as well as some big unknowns. Among the highs are strong grassroots campaigns, top-level political support, and appealing to multiple priorities. Potential lows include issues like "open washing" leading to decreased momentum ("peak open") and data quality problems. Big unknowns center around maintaining commercial and government support over time as well as challenges involving personal data protection and ensuring ongoing data discovery and reuse.