Nottingham University on wormholes. (Specifically Portal 2’s) Be sure to watch the video responses as well. It’s about 30 minutes all together.
I found it all very interesting, and honestly had never known that Einstein actually found a way to create a wormhole (Einstein-Rosen bridge,) that worked. (But was so unstable that not even a ray of light could pass through.)
Posting this half way through the first video but I’ve found it pretty cool so far so I thought I’d share it.