If we all worked on the assumption that what is accepted as true were really true, there would be little hope of advance.

No flying machine will ever fly from New York to Paris.

The airplane stays up because it doesn't have the time to fall.

"If birds can glide for long periods of time, then… why can’t I ?”

No flying machine will ever fly from New York to Paris ... [because] no known motor can run at the requisite speed for four days without stopping.

We were lucky enough to grow up in an environment where there was always much encouragement to children to pursue intellectual interests; to investigate what ever aroused curiosity.