Why does a bus have a bigger steering?

Many things around us, as adults, we often take for granted. Which is why questions like the one above from children, often leave us stumped for answers. 

A bus steering is bigger than a car steering, and that is quite obvious. Why does it have to be so, nobody ever asked. And thankfully, on the internet, there are answers to such questions as well and we did get the answer. Do google the question and see what the answer is - the answer in itself is quite interesting.

Which brings me to the point that as adults, we often take many things around us for granted. And since we take a lot of things for granted, there is no enquiry in that direction and thus no learning happens in that space.Where there is no enquiry, there can be no learning. 

How does one keep oneself curious and asking questions and enquiring and learning, in an organization? And if you run training, how do you do that?