nostr:npub1zdp33shl69xr0uq3x8n5gsjykq9upycwh6nqm02c3f6x0frrn0dq42vqv8 My school math teacher -- and RAF navigator --  told me that Britain lost most of its mathematicians in the air over Germany, and basically it wasn't until the 1970s that there was enough expertise in *teachers* for high school students to learn math as they did before the war.