"Scientists have one thing in common with children: curiosity.

"Scientists have one thing in common with children: curiosity. To be a good scientist you must have kept this trait of childhood, and perhaps it is not easy to retain just one trait. A scientist has to be curious like a child; perhaps one can understand that there are other childish features he hasn't grown out of. "
-- Otto Robert Frisch (physicist, 1904-1979)
http://en.wikipedia.org/wiki/Otto_Robert_Frisch