"For example, the borosilicate glass Schott BK7[1] is an extremely common crown glass, used in precision lenses."
https://en.wikipedia.org/wiki/Borosilicate_glass
what else....the borosilicate and 'boris'....borrow-silly-cat....go figure:
...Cameron used to laugh about lending out 'silly cat'...oh and he had once lent 'silly cat' to may....which was a bit of a mistake, let us say (those like may never give anything back "all mine!" etc etc)....although 'silly cat' was then to fight back....and yes, we're talking about child alters.....go figure:
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