As a child we learn from experience or being taught: we learn the oven is hot because we have touched it or were told it was hot by someone who had touched it. Common sense allows us to apply learned behavior to new situations, but not all new situations lend themselves to “common sense”.

We teach railroad operations and there are few if any situations that would allow a person to understand that, for instance, a loaded railcar traveling at 10 mph has the same momentum as an automobile traveling at…500 mph!