Shalom, an EMT with Israel’s United Hatzalah was in the vicinity of the recent fatal Jerusalem bus crash but had no medical equipment at the time. He saved a young victim with severe injuries by stemming the blood flow from one of her legs by tying his tzitzit (small prayer shawl) around it as a tourniquet.
https://israelrescue.org/blog/tzitzit-saved-the-life-of-a-bus-crash-victim/