What type of evidence do the authors use in this excerpt?
historical examples of political changes
personal anecdotes about the impact of social media
research studies that correlate politics and social media
social media posts about the arab spring

the president was the speaker and it was a great part of history.

explanation:

video of the national aeronautic space administration's (nasa) coverage of president john f. kennedy’s address at rice university, houston, texas, concerning the nation's efforts in space exploration. in his speech the president discusses the necessity for the united states to become an international leader in space exploration and famously states, "we choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard."

what excerpt?

explanation: