Is there a big difference in IQ between people?

It shouldn't be too big. It's just a matter of energy distribution.

Some people are focused, distracted and interested, and it is easy to achieve something in one field.

Then his IQ should be high in the eyes of others. But many people with so-called high IQ have achieved nothing because they are distracted and unfocused. How high do you think their IQ is?

I think there is an opportunity:

Just like an apple hitting Newton's head, Newton will consider why the apple landed and then discover Newton's law. Is Newton clever? Not necessarily. Maybe an apple was hit on a head smarter than Newton, but they never thought about why.

There is no difference in IQ, mainly whether you are focused or not and whether the opportunity has come.

Personal point of view