Another cause of sore throat is allergies that promote postnasal drip. There are, however, more serious conditions of the sinuses and throat that may cause the throat to be sore. If you are experiencing an ongoing sore throat, ask your ear, nose, and throat specialist to examine you.
1907: Samuel Simon patented the first screen printing method in Manchester, England, which was most commonly applied to wallpaper and expensive fabrics. He used rubber bands or squeegees, which are still commonly used in the screen printing process today.
No one knows how old the stencil is. The idea is so simple that historians believe stencils may have been used thousands of years ago. The silk-screen stencil is believed to have been invented in Asia as long ago as A.D. 500. By the 1600's, silk-screen printing was a highly developed art in China and Japan. It spread gradually to Europe. Samuel Simon, of England, received the first patent for silk-screen stencil printing in 1907.