well first they must come up with a hypothesis or a question to find the answer to. then they must come up with an experiment that will either prove or disprove their hypothesis and publish their findings for others to gain from. its a long process that i have oversimplified since experimentation needs a wide range of variables and randomized subjects but the gist of it is exactly that.
Explanation:
this is just an example of how scientists can learn new things
It is foreshadowed that Susan is at a zenith, a highpoint in her life. This, however seems to be the last highpoint that she will ever be at, insinuating that the rest of her life was much more depressing and less exciting.
