fear of flying

From the Paul Coelho blog :

Dear readers,

I’m back from Milan and on Thursday I had a conference at the Teatro Dal Verme with the mathematician Michael Atiyah. This very important mathematician made a very interesting speech in which he mentions the bumblebee. Indeed, according to the laws of aerodynamics and of physics, the bumblebee should not fly. Yet, as Sir Michael Atyiah said :

“the bumblebee flies because it doesn’t know about the technicalities of aerodynamics.”

That leads us to the question of the week:
How many things we don’t do in life because we think beforehand that they are impossible? Like everybody says that the bumblebee is incapable of flying?