Glass manufacturing developed extensively to get to that point, and it has come a long way further to bring us to today where windows are strong, regularly used, and perfectly see-through. And glass ...

How is sea glass made? Per the retailer Sea Glass Jewelry By Jane, sea glass starts as broken, discarded glass tossed into the ocean and tumbled by waves.

The secret to the original PYREX’s heat resilience is its borosilicate composition, a glass made of silica and boron trioxide. Glass expands when it’s hot and contracts while cooling.

The move comes as Apple has pledged to invest nearly $600 billion domestically over the next four years, officials announced Aug. 6.