Answer:
The final sentence contributes to the end o the article to show we might have fun by doing something one way instead of the other and that we don't know we can enjoy it before doing it.
Explanation:
The sentences are used to point out that sometimes we act based on someone else's thoughts or opinions, and that might be not true. Also, sometimes we can find incredible experiences by trying to achieve our objectives by doing one action instead of others. That there is an infinite amount of probability we can't perceive what could be of value because we have not experienced it.
Answer:
"And for Leo, and other adventure seekers like him, soaring through the skies in an aircraft powered only by the invisible forces of nature comes as close as one can get to realizing that dream."
In "A Raisin in the Sun" shows Mama's dream someday of having her own little garden at the back of her own house. Though she's close at quitting and giving up her dream, nurturing her plants simply implies that she's not giving up her dream, herself and of course, her children as well.