What improved the living conditions of poor europeans as a result of the columbian exchange?

What was one of the accomplishments of the space shuttle that what was one of the accomplishments the space shuttle that facilitated communication and entertainment ?

Which of the following is an effect that constantine's conversion to christianity had on the roman empire?

"if i have seen farther than others," said newton, "it is because i have stood on the shoulders of giants." who were the giants to whom newton was referring? could this be said of any scientific accomplishment? explain.