How many time you gone through these situations:
1. Hey that guy was silliest guy of my class, always asking strange/silly/weird/confusing questions.
2. Got struck in solving a problem for hours and finally it was just a silly mistake or solution you have not think that can create problem. Or being a programmer it was just a line of change.
there can be many situations similar to the above ones, one common thing is that most humans have a tendency of being ignorant. It got generated due to the fobia of being humiliated.
Most Makers/Innovators lack this fobia. They asks questions, they do not afraid of doing silly things.