Answer:
I would say Brian matures through his new ability to have patience throughout the novel. The setbacks that would have immobilized the old Brian now he can manage it. He also learns how he can control his temper because he realizes how frustration and hopelessness doesn’t make it any better It just makes the situation worse.
hope this helps :)
Add some more commas and periods. This might fix some run-on sentences in there.
I think its "Whose" because 'Who's" is shortened for "Who is"
Answer:
The Einstein–Szilárd letter was a letter written by Leó Szilárd and signed by Albert Einstein that was sent to the United States President Franklin D. Roosevelt on August 2, 1939. Written by Szilárd in consultation with fellow Hungarian physicists Edward Teller and Eugene Wigner, the letter warned that Germany might develop atomic bombs and suggested that the United States should start its own nuclear program. It prompted action by Roosevelt, which eventually resulted in the Manhattan Project developing the first atomic bombs.