Add Yahoo as a preferred source to see more of our stories on Google. 0 intro gettyimages 1188966790 i There is a reason test pilots have a reputation for cool-headed bravery. Historically, it has ...

There is a reason test pilots have a reputation for cool-headed bravery. Historically, it has been a dangerous occupation, with many planes ending testing in fiery explosions or on the seafloor. Some ...