You are currently not logged in. Please Sign In to continue
TED-Ed-Questions No One Knows the Answers to
Who knows when we'll discover whether we are alone in the universe or not? Whatever the answer, the quest for more knowledge will never cease, nor grow dull.
If you’d like to watch this and more videos, join our free trial.
Spanish
French
German
Italian
Chinese
English 
Español
Français
Italiano
Deutsch
Português
