The counterintuitive fact underlying all of this is that mixing two soft metals frequently produces something substantially harder than either, and the reason is geometric. Here are twelve.
1. Why…
Source: Wikipedia
There is an object in a museum case in London that does something a piece of fourth-century glass has no business doing.
Look at it with the light coming…
Transparency is so familiar that it stops registering as strange. You look through a window and see the street, and it does not seem to require an explanation.
But consider…