MacArthur was insubordinate with President Harry S Truman, who as president is commander in chief of all the armed forces. MacArthur wanted to expand the war in Korea after the Chinese entered the war, and he made comments to this effect after he had been told not to.
It would be a terrifying experience because it is something that is unexpected and a jet is very fast
Trade route from Europe to China had always been a land route before the discovery of sea route in 15th century.
When a planet has an elliptical orbit its speed varies throughout its orbital period. If it had a circular orbit then its speed would remain constant throughout.