.Publisheru00e2 $ s note Springer Attributes remains neutral for managerial insurance claims in published maps and also institutional affiliations.This is a review of: Hanson, C. et al. A time-stratified, caseu00e2 $ "crossover research of heat visibility and perinatal death from 16 health centers in sub-Saharan Africa. Nat. Med. https://doi.org/10.1038/s41591-024-03245-7 (2024 ).