Could someone write a narrative about Once in A Lifetime link here

https://www. literacyshed. com/onceinalifetime. html

What is a brief and often humorous statement of truth or opinion such as a watched pot never boils

The conventions of a number of the states, having at the time of their adopting the constitution, expressed a desire, in order to prevent misconstruction or abuse of its powers, that further declaratory and restrictive clauses should be added: and as extending the ground of public confidence in the government, will best ensure the beneficent ends of its institution. what is meant by the phrase "further declaratory and restrictive clauses"?

According to eric shlosser’s introduction to fast food nation what is his book primarily about?