A mid-sized jet, the 757 isnât nearly the size of a 747 or 777, but thanks to a nasty aerodynamic quirk it produces an outsized wake that, according to one study, is the most powerful of any airplane. To avoid wake upsets, air traffic controllers are required to put extra spacing between large and small planes.
Causes: Colorectal cancer: All kinds of cancer occur when cell division, normally a very highly regulated process, gets out of control. While environmental factors can certainly contribute to a person's risk of cancer (e.g. smoking, diet, and exercise), most cancers have a genetic basis too.
In its early stage, colorectal cancer usually produces no symptoms. The most likely warning signs include: 1  Changes in bowel movements, including persistent constipation or diarrhea, a feeling of not being able to empty the bowel completely, an urgency to move the bowels, rectal cramping, or rectal bleeding.2  Dark patches of blood in or on stool; or long, thin, pencil stools.all Your Doctor About Colorectal Cancer if: 1  You notice a change in your bowel movements, experience bleeding from the rectum, or notice blood in or on your stool. 2  You experience persistent abdominal pain, unusual weight loss, or fatigue. 3  You are diagnosed with anemia.