Operating systems

http://computer.howstuffworks.com/operating-system.htm

There are several operating systems on the market today. For example there is windows 7, Mac OS X and Linux. However not all computers have operating systems. There are many computers such as those in a microwave or refrigerator that simply don't need an operating system. On the other hand there are many devices such as cell phones that have their own unique or small operating system. The day to day computer user generally uses a PC that run a Microsoft operating system, and many businesses and corporations use Linux on their computers. The operation system is sort of a parent, they keep things working smoothly and keep resourses from being hogged by one system or another. All in all an operating system is critical to keep your computer working properly.

Here is an picture of the Linux penguin blowing up the windows symbol...

X-ray computed tomography

Computed tomography is a medical imaging device that in conjunction with MRI is considered one of the most important medical inventions in the 20th century, also the United States has more CT scanners per person than any other country in the world! This technology 100% relies on computers for their operation. in a sense it is similar to a scanner, except it uses x-rays to take "pictures" of sections of a body part. The images are then input into a computer and placed in the proper order to create an image. It is one of the best and fastest tools for studying the chest, abdomen and pelvis because it provides detailed, cross-sectional views of all types of tissue.  The above image shows a CT image of a pulmonary embolism, and as a result of this image the person's life was most likely saved.

http://www.radiologyinfo.org/en/info.cfm?pg=bodyct