Please help with these questions from the Fault in our Stars book.

Chapter 15:

How did “Memorial” hospital differ from “Children’s” hospital?

What art display did Hazel take Gus to two weeks later? Why?
Chapter 16:

When Gus tell s Hazel that it’s a “good life” what do you think he’s trying to teach her?

What is nostalgia? What does this word have to do with Gus?
Chapter 17:

What is an obituary? Why is Gus having a hard time thinking about his?

Look at the top paragraph on p. 241. Put in your own words what Hazel was trying to tell Gus.