Cross-sector intersections
Where biology meets another industry, the honest question is the same: does the mechanism survive the application's physics budget.
Boundaries are where an honest page is most at risk: a “bio-IT” or “bio-city” entry can describe a market instead of a mechanism. This cluster holds one line of defence: at every intersection, test whether the biological mechanism survives the application’s budget. Biometric authentication works while forgery costs more than verification, and a marker’s strength is the minimum of three quantities — uniqueness, stability, readout discipline. Bioluminescent lighting runs into arithmetic: one substrate molecule per photon, orders of magnitude short of infrastructure lux. In-space bioprinting genuinely removes sedimentation and buoyant convection — and immediately hands leadership to surface tension and the diffusion limit.
Start with biological authentication & identification: the uniqueness–stability–readout triangle is the model of how a boundary page stays science.