As Arthur C Clark put it:
When a scientist states that something is possible, you can be almost 100% sure they are right; when the same scientist says something is impossible, the probability is almost 100% that he is wrong.
To think outside the box, you have to know the box. New discoveries are never inside the box, but always close to the box's limits. But if you don't know the box, you can't discover something new -
99.99999% of the people who complain about others not considering something new as real or scientific haven't looked inside the box that is modern science!