Try These 4 Trippy Thought Experiments to Expand Your Mind

What would it look like to rewind WWII? How would beings of higher intelligence view us? Contemplate these concepts and more.

What would it look like to rewind WWII? How would beings of higher intelligence view us? Bottom right: Woman thinking (Fuse/Thinkstock); Top right: Ant (Eye Blink/iStock/Thinkstock); Top left: Artist's concept of WWII planes ; Bottom left: Woman looking at her younger self through a mirror (Shutterstock)Shutterstock

In a thread on the social media site Quora, users shared the best thought experiments they know of. Epoch Times has collected four especially impressive experiments. 

1. Seize the Day

Sal Khan, a famed educator and entrepreneur named one of Time Magazine’s top 100 influential people in 2012, offered the following inspirational thought experiment during his commencement address to MIT’s class of 2012. 

Quora user Gagan Gupta posted the transcript of this experiment. 

Sal Khan Neilson Barnard/Getty Images for The New York Times