A Green Card holder who is not a minor can file Form N-400, Application for Naturalization, to obtain US citizenship. Similarly, he must have become a permanent resident before five years and must have remained as a permanent resident in America for at least five long years.
Now, flat paint is (usually) a latex paint that dries without a reflective finish-that's it-the finish is smoother (imho) than chalk paint. Chalk paint really dries quickly and it has a rough texture to it after it dries. Many people use wax or poly-acrylic sealant on top of their furniture piece to keep the paint from peeling. So there ya go, my best explanation.
Flat Enamel. Flat enamel is a paint with a durable flat, matte finish. It's a good choice for powder rooms and halls, as it holds up to occasional cleaning. Eggshell Finish. If you can picture the very low sheen of the shell of an egg, you have an idea of how an eggshell paint finish will appear.