Sandbox · Cross-topic Rising topic adjacencies → Topic pairs whose Arkansas-internal collaboration density has been climbing across snapshots. Descriptive trend, not investment recommendations. Sandbox · Researchers Interdisciplinary catalysts → Active Arkansas researchers whose co-authorship neighborhoods span the most distinct research topics — a structural ranking of who already bridges fields. Sandbox · National signals Frontier leadership candidates → Emerging research areas (high CAGR, low concentration) where Arkansas already has adjacent strengths to leverage. Candidates surfaced for the conversation, not prescriptions. Sandbox · National signals Climbing leadership candidates → Topics where Arkansas already shows up in the global top 5–50 and the field still has room at the top — structural headroom to build from existing position.