Polymethyl methacrylate (PMMA) is the scientific name of the transparent plastic sold under many brand names, such as Lucite. Its many uses include contact lenses, aquariums, acrylic paint and dentures. Unlike glass, PMMA is shatterproof, but PMMA is softer and more easily scratched, so a scratch-resistant coating is often added.
The four New World voyages of Italian-born Christopher Columbus were made under the sponsorship of Spain. You knew that, right? But in what language did Columbus maintain his personal journal?
Tuesday’s answer: According to the latest Census Bureau estimates, the U.S. county with the smallest population is Loving County, Texas. With a total area of about 670 square miles, its current population is about 50.