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).
Who invented camera? Johann Zahn designed the first camera in 1685. But the first photograph was clicked by Joseph Nicephore Niepce in the year 1814. It was thousands of years back that an Iraqi scientist Ibn- al- Haytham made a mention of this kind of a device in his book, Book of Optics in 1021. The earlier cameras were incapable of saving the images and were huge in size.