The hot weather that has been afflicting Americans in remote national parks is also grounding emergency helicopter flights that could rescue them. That’s because helicopters can’t fly in ...

That’s why the GoAERO Prize competition, a NASA partner, has promised more than $2 million in reward money for the creation of Emergency Response Flyers—incredibly advanced rescue helicopters.

"Many helicopter pilots not only participate in competitions but also collaborate with volunteer groups engaged in search and rescue operations. I have personally participated in several search ...