Greg and Tatiana have published their paper “Force-Rate Characterization of Two Spiropyran-Based Molecular Force Probes” in J. Am. Chem. Soc. The paper provides important single molecule force benchmarks for mechanochemical activation of spiropyran, and these should help drive a quantitative interpretation of the many studies using this probe. It also describes the first quantitative measure of regiochemical effects in a pair of mechanochemical couplings.