Open Problems Column Monochromatic Unit Squares: Exposition and Open Problems

I invite any reader who has knowledge of some area to contact me and arrange to write a column about open problems in that area. That area can be (1) broad or narrow or anywhere inbetween, and (2) really important or really unimportant or anywhere inbetween. A better, in color, and up-to-date version of this paper can be found at the following link: https://www.cs. umd.edu/~gasarch/open/MONOUNIT/monounit.pdf.