People Argue Against the Possibility of Time Travel by Saying

question 42

Multiple Choice

People argue against the possibility of time travel by saying, "If humans will eventually be able to travel back in time, then where are all the tourists from the future?" This idea is similar to
The ________, only applied to time travel instead of alien space travel.

• A) Drake equation
• B) cosmological principle
• C) Fermi paradox
• D) Urey-Miller experiment
• E) evolutionary tree of life

---

Definitions:

Tacit Knowledge

Knowledge that is difficult to transfer to another person by means of writing it down or verbalizing it, often gained through personal experience.

Civilian Conservation Corps

A public work relief program in the United States during the Great Depression that provided unskilled manual labor jobs related to the conservation and development of natural resources.

NRA Codes

Regulations established by the National Recovery Administration during the New Deal in the United States to set fair competition standards, establish minimum wages, and limit work hours to stimulate economic recovery.