Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

In Interstellar, when Murph visits her brother and his wife, she notices that their son is coughing hard, and she offers to arrange a visit from a doctor for him. The brother and his wife refuse, however, even though she warns them their son will die otherwise.  Did it signify anything? I thought that maybe it signified that there is an anti-science movement because of the blight. The brother certainly seemed to dislike his father and sister's scientific pursuits.
Why did Murph's brother and his wife refuse a doctor for their son in Interstellar?

In Stranger Things 2, they say the portal takes a lot of energy to close, and that only El has the power to close it. But in the first season, portals to the Upside-Down crop up all over the place- in the Byers' home, in the tree in the woods, and by the swimming pool. What's the difference between the Hawkins' lab portal and the other ones?
Why is the portal so hard to close in Stranger Things 2, when the monster opened many in the first season?

In Harold & Muade, Harold gave her a small gift to maude:    Maude:This is the nicest present...that I've received in years.    Maude: (She threw the gift)    Maude: So I'll always know where it is.   What is the meaning of Maude words to Harold after throwing the gift?

What is the meaning of Maude words to Harold after throwing the gift?