Richard Serra is more interested in the act of making than h…

Richard Serra is more interested in the act of making than he is interested in the resulting artwork. He’s trying to invent artistic strategies that allow him to see in ways that he hasn’t seen before in order to extend his vision. Why would he be interested in that?  https://www.youtube.com/watch?v=G-mBR26bAzA    

Amylase (which breaks down starch) is secreted in the mouth…

Amylase (which breaks down starch) is secreted in the mouth of humans. Amylase functions in the mouth but stops functioning once it hits the stomach environment. (a) What is the best explanation as to why amylase does not function in the stomach? (b) What is likely happening to the enzyme to prevent it from functioning? (I am looking for a special word.)