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DEFINITION: (adjective) Of, relating to, or marked by perfidy; treacherous. SYNONYMS: punic, treacherous. USAGE: After Frank betrayed him, James swore he would never forgive his friend's perfidious behavior.

Porsche was an engineer best known for developing the original Volkswagen automobile and for his contributions to advanced German tank designs. Entering the automotive industry in 1896, he showed enormous natural aptitude in the field. In Vienna, he snuck into night classes at the Technical University, but received no other formal engineering education. His son, Ferry Porsche, was the eponym for the Porsche automobile, initially based on the Volkswagen Beetle design. How is "Porsche" pronounced?

San Marino is the world's smallest republic and claims to be Europe's oldest existing state. According to tradition, Marino, a Christian stonecutter from Dalmatia, took refuge on Mt. Titano, the chief geographical feature of present-day San Marino, and by the mid-5th cent., a community was formed. Because of its relatively inaccessible location and its poverty, San Marino has succeeded, with a few interruptions, in maintaining its independence. When did San Marino become a member of the UN?

Utah's Bryce Canyon is known for its spectacularly colorful landscape and its geological structures that resemble miniature cities, cathedrals, and spires. These structures, known as "hoodoos," were formed when water, frost, and wind acted on alternate strata of soft and hard limestone, resulting in colorful and unique forms. The canyon region was settled by Mormon pioneers in the 1850s and was named for Ebenezer Bryce, who homesteaded in the area. How is Bryce said to have described the canyon?

Researchers at the Uni versity of California, Riverside found that sunscreen, if not used correctly, can actually attack skin and leave it vulnerable to UV radiation. Scientists found that 3 widely used, FDA-approved UV filters generate ROS molecules when exposed to UV radiation. These molecules cause visible signs of aging by damaging cell walls and the DNA inside them. Researchers recommend choosing a sunscreen with a high SPF and reapplying it frequently.