In this video I am talking to some 9 year olds who go to a private English school in a small city in Brazil.

I asked them in Portuguese "Who would like to help me learn Portuguese?"

All of them raised their hand. They were even enthousiastic about it.

They had only met me a few minutes before.

This is more evidence that young people like to help others, and that this is something innate in humans. In other words this video clip seems to support the hypothesis that it feels good to help others.

And it seems to support the hypothesis that no external motivation is needed. No promise of a reward and no fear of a punishment.

They spontaneously raised their hands and I believe they truly would all feel good helping me and no "reward" would be necessary.