Irritable bowel syndrome (IBS) is an uncomfortable gastrointestinal disorder that can affect your large intestine, also known as your colon. It can cause a plethora of uncomfortable and potentially embarrassing symptoms, from bloating and gas to constipation and diarrhea. Learn how to recognize the most common symptoms of IBS. One of the most common symptoms of IBS is abdominal discomfort or pain. You may experience stomach cramping after eating a meal. It may get better after you have a bowel movement.
The Camera Obscura is a 19th century optical device often used by artists to make quick sketches in the field. A competing device is the Camera Lucida. Camera Obscura means dark room, and the use of a pinhole in a window blind to form an inverted image of an outside scene on an opposite wall of a dark room has been known since at least the time of the Arab scholar Ibn al Hait[h]em (or Alhazen, ca. 956-1038).
The first partially successful photograph of a camera image was made in approximately 1816 by NicÃ©phore NiÃ©pce, using a very small camera of his own making and a piece of paper coated with silver chloride, which darkened where it was exposed to light.