What am I?

A PUZZLE FOR YOU TO SOLVE:
I want no cheating, no backtracking to my previous Blips and those of you with good memories are banned from taking part.
CLUES:
I am photographed from an unusual angle.
If you collect what they I sit upon, you are known as a tegestologist.
0.56 ml of my contents will be lost in facial hair.
Tossing salted peanuts into my contents will make them dance.
I hold something defined as a staple food in Bavaria.
I hold the second most popular beverage in the world.
Sometimes I am half full, sometimes half empty.
I am made from a fragile material.
What am I?
Back to work today and our members had the time of their lives glass painting.It is such a fabulous medium to work with.
"Among the many thousands of things that I have never been able to understand, one in particular stands out. That is the question of who was the first person who stood by a pile of sand and said, "You know, I bet if we took some of this and mixed it with a little potash and heated it, we could make a material that would be solid and yet transparent. We could call it glass." Call me obtuse, but you could stand me on a beach till the end of time and never would it occur to me to try to make it into windows."
Bill Bryson.