What are some signs of intelligence? and some reasons high-IQ individuals turn out to be failures in the end?

1. They stare more at the walls than other people.
2. Imagination never leaves them. 
3. Without imagination, they are nothing.
4. Leave the group when they find people in them incompatible to them.
5. Generally polite, mature, good knowledge about philosophy of life.
6. Find uncomfortable to follow the rules.
7. Struggle a lot in their work. That is what gives them happiness.
8. Lot of self-respect for themselves.
9. In silence, they are always happy and peaceful.
10. All they need is love. That can attract them strongly.
11. Love the company of curious people.

They ask you questions.

When you answer, they ask you more.

When you start using big words, they ask for clarification.

When they can’t understand anything you’re saying, they ask for you to explain it to them as if they were a five-year-old.

When you say something intriguing, they write it down in their notebook or phone.

These people are not naturally more intelligent. They’re better learners which makes them more intelligent.

Why do they learn better?

They’re genuinely curious and ask questions from a humble standpoint. I’ve met billionaires who’ve said, “explain it to me as if I were a five-year-old.”

This simple phrase has changed my life when it comes to learning.

As soon as you stop asking questions, you stop learning.

As soon as you stop writing down ideas, you forget them.

The hardest part of becoming intelligent is not bullshitting yourself about what you know; it’s being humble enough to ask questions. If you can do this, then people will see you as intelligent, too.