×
Log in
Get Started
Travel
Technology
Sports
Marketing
Education
Career
Social Media
+ Explore all categories
Report -
Towards a Physical Analogue of a Gott Time Machine · The grandfather paradox What happens if the returning pilot tells themself never to leave? Similarly, what if they go back further
Select
Pornographic
Defamatory
Illegal/Unlawful
Spam
Other Terms Of Service Violation
File a copyright complaint
Please pass captcha verification before submit form