Ever watch a young child?
Other than getting fed, their defining characteristic is curiosity. They're driven to learn as much as possible about everything around them. That's how you survive, if you're a lion cub or a quail chick.
Curiosity is a natural passion. It cools as we start feeling somewhat comfortable on Earth, but it persists. If pressure from parents and schools doesn't kill it, it can last a lifetime.
Unfortunately, schools often kill curiosity.