Hifjul Bari Taposh
Hifjul Bari Taposh answered Steve Theunissen's question

Modern glass is made by melting together several minerals at very high temperatures. Silica in the form of sand is the main ingredient and this is combined with soda ash and limestone and melted in a furnace at temperatures of 1700°C. Other materials can be added to produce different colors or properties.

Darik Majoren
Darik Majoren answered Perry Nuttal's question

We have evolved from a social pack (group) oriented animal to the civil society we are now . . . For the most part.

We do maintain much of inherited instincts although they are much more subconscious in our everyday life. The animal instinct toward survival is still very much alive in us . . … Read more

Dumb Goat
Dumb Goat answered Perry Nuttal's question

Good question! It is such question that really brings into light the notions of "domestication" or the concept of humans as an apex predator in general.

Domestication, like many things, has a lot of gray area rather than something that is set in stone. It is better to approach this from an angle of identifying … Read more

AnnNettie Paradise
AnnNettie Paradise answered

The crust is made up of much lighter rock containing many elements, particularly oxygen and silicon, as well as aluminum, iron, calcium, sodium, potassium and magnesium, in order of their abundance. Oxygen and silicon, both nonmetallic elements, make up about three fourths of the total crust by weight and 93 percent by volume. Then there … Read more