Our best theory of gravity no longer belongs to Isaac Newton. It’s Einstein’s General Theory of Relativity. There’s just one problem: it is incompatible with quantum theory. The effort to tie the two together provides the greatest challenge to physics in the 21st century.

**SHORTLISTED | Quantum Shorts 2014**

How can Wigner's Friend be sure that his Friend-with-benefits mailed a very important envelope? Verschränkung = Entanglement.

This film is best experienced when listened to with headphones at a safe volume.

Seth Wiley lives and works in Los Angeles, CA. This is his second film for Quantum Shorts ("Heisenberg," 2012.)