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 transition from room sized camera to a portable camera was envisaged in 1685 by Johann Zahn. The first camera was invented by Alexander Wolcott. His camera design was patented on 8 may, 1840. With the invention of Alexander Wolcott it was possible to click candid pictures that did not fade away with time. However, the earliest photographs were not taken with Alexander Wolcott's invention.