Macquer found the purest gypsum invitrifiable by solar heat ; that of Monmartre seemed to yield , but probably was not pure. Even the heat excited by pure air , if continued long enough to dissipate the acid , cannot vitrify it

That wall has to be at least three wythes of brick to support your load.

One particularly damaging, but often ignored, effect of conflict on education is the proliferation of attacks on schools[…]as children, teachers or school buildings become the targets of attacks. Parents fear sending their children to school. Girls are particularly vulnerable to sexual violence.

I think that the construction of a polehead to take care of the overhead ground wire is open to criticism.