"For Joe and the rest of the flight-test crew, that meant 10- to 12-hour days outdoors flying the drones, sometimes in freezing temperatures or while standing i

"For Joe and the rest of the flight-test crew, that meant 10- to 12-hour days outdoors flying the drones, sometimes in freezing temperatures or while standing in fields of two-inch-deep mud and cow excrement or, at other times, dealing with the Central Valley's infamous 100-plus-degree heat." I don't understand why takeoff aerodynamics under these extremes (and more extreme, uh, extremes) couldn't have been simulated in a wind tunnel. Also, couldn't simple ageism have been a factor as well?