In this scene someone else sees the apple fall and they wonder why that happened. Issac newton is most famous for finding out about the gravitational pull in space.
Issac newton was in his house when he saw an apple fall out of a tree that made him curious.This is important today because that is how the planets stay in order and we stay on the ground. If we did not know this then we would have many questions and we would not be as advanced.
This scene is someone who was responding to the other civilian. A very famous quote from Issac Newton is "what we know is a drop what we don't know is an ocean"