More odd physics things.
I consider this a fun fact: you could condense some interstellar molecular clouds into REALLY big martinis (sans olive or vermuth). (Ok, it might be a little toxic)
Mirrors would not work without quantum mechanics (assuming you could get light to work without QM).
Black holes could be considered boring. If you know the mass of a non rotating black hole, you can calculate almost all of its other attributes.
The state of a particle can be "coupled" to the state of another particle on the other side of the observable universe.
Einstein did not win his nobel prize for relativity.
There is a smallest possible unit of time, and we actually know how long it lasts.
Einstein's biggest mistake was not a mistake.
Lithium Beryllium Nitride is the only salt where the small ions will fit in the holes left by a close packed lattice of the larger ions. (I am considering lithium nitride and beryllium nitride to be degenerate cases of Lithium Beryllium nitride).
Photons take many centuries to work their way out from the center of the sun.
Diffraction gratings - nuff said.
When considering fission and fusion reactions, iron is by far the most stable element (lowest energy) but very very little of the universe made of iron.
Universes have a lot of similarities to black holes.
Some areas of math have zero application to any physical phenomena.
Some areas of math had zero application to any physical phenomena until a few bridges fell down.
Extremely bright people, capable of understanding extremely complex subjects can be incapable understanding what situations require consideration of anthropomorphic principles.