Here's two new things I've learned:
It has been suggested that the Casimir forces have application in nanotechnology, in particular silicon integrated circuit technology based micro- and nanoelectromechanical systems, silicon array propulsion for space drives, and so-called Casimir oscillators.
There is a theory that exotic matter (material that has negative mass/energy) could be used to hold the 'throat' open of a Schwarzchild wormhole.
Today I'm going to learn what a Krasnikov device is.
What have you learned lately?