Why is the word "ignorance" a noun?

Read the excerpt from "death by black hole."albert einstein's general theory of relativity, published in 1916, provides the insight to understand the bizarre structureof space and time in a high-gravity environment. later research by the american physicist john a. wheeler, and others, to formulate a vocabulary as well as the mathematical tools to describe and predict what a black hole will do toits surroundings.read the excerpt from "man listening to disc."and i bow deeply to thelonious monkfor figuring out a wayto motorize or whatever-his huge pianoso he could be with us today.these excerpts are similar because both texts

Nthis poem by ruskin bond, what does the use of the word heart-beats suggest about the narrator's attitude toward life?

When mrs. jameson says "it (the desert) won't leave you cold," what does she mean?