Which aesthetic impact is the ending of "gravity" most plausibly meant to have on the reader?

The speaker in the “to a mouse” regrets that the mouse runs away so fast because the

If someone wants to funds to you stick around it means they’re going to give you money

Hillenbrand writes, "as louie blazed through college, far away, history was turning" (p. 43). why does the author interrupt louie's narrative with information about japan and germany?