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.
The lifetime chance of developing colorectal cancer is 1 in 20, with women facing a slightly lower risk than men. The Centers for Disease Control recommends colorectal cancer screening beginning at age 50 for both women and men. Overall, only about 6% of men in the U.S. develop colorectal cancer, but several factors increase your risk: Age: Men younger than 40 almost never develop colorectal cancer.