It's normal for parents to support your children's dreams
Nancy is at home when her son Paul comes in and tells her he wants to be an astronaut when he grows up.
Nancy wants to mention how hard that would be.
Nancy tells Paul that it's a difficult tasks but that if others have done it so can he if he works hard.
Nancy tells Paul that it's an impossible dream since only a few people every few years get to be astronauts.
Paul is full of inspiration and drive and wants to prove to his mom he can be one of the few who make it.
Paul feels terrible because he's being told his dream is not possible and is discouraged from trying.