Addition of lead(II) oxide lowers melting point, lowers viscosity of the melt, and increases refractive index. Lead oxide also facilitates solubility of other metal oxides and is used in colored glasses. The viscosity decrease of lead glass melt is very significant (roughly 100 times in comparison with soda glasses); this allows easier removal of bubbles and working at lower temperatures, hence its frequent use as an additive in vitreous enamels and glass solders. The high ionic radius of the Pb2+ ion renders it highly immobile in the matrix and hinders the movement of other ions; lead glasses therefore have high electrical resistance, about two orders of magnitude higher than soda-lime glass (108.5 vs 106.5 Ohmcm, DC at 250 C). For more details, see lead glass.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Pb2+ causes lead glass to have what?
Ah, so.. high electrical resistance

Like most of southern California, the majority of San Diego's current area was originally occupied by chaparral, a plant community made up mostly of drought-resistant shrubs. The endangered Torrey pine has the bulk of its population in San Diego in a stretch of protected chaparral along the coast. The steep and varied topography and proximity to the ocean create a number of different habitats within the city limits, including tidal marsh and canyons. The chaparral and coastal sage scrub habitats in low elevations along the coast are prone to wildfire, and the rates of fire have increased in the 20th century, due primarily to fires starting near the borders of urban and wild areas.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Where can one find the most sage scrub in San Diego?
Ah, so.. low elevations

In the United States, "Cultural Studies" focuses largely on the study of popular culture, that is, on the social meanings of mass-produced consumer and leisure goods. Richard Hoggart coined the term in 1964 when he founded the Birmingham Centre for Contemporary Cultural Studies or CCCS. It has since become strongly associated with Stuart Hall, who succeeded Hoggart as Director. Cultural studies in this sense, then, can be viewed as a limited concentration scoped on the intricacies of consumerism, which belongs to a wider culture sometimes referred to as "Western Civilization" or as "Globalism."
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): In the UK what does "Cultural Studies" focus little on in this field?
Ah, so..
unanswerable