Involvement of the lung causes shortness of breath or fatigue during physical activity. Many patients with scleroderma become less physically active because of musculoskeletal complaints or the fatiguing nature of the illness. Hence many will not be physically active enough to actually develop shortness of breath.
Computer hardware engineers research, design, develop, and test computer systems and components such as processors, circuit boards, memory devices, networks, and routers. These engineers discover new directions in computer hardware, which generate rapid advances in computer technology.
by HowStuffWorks.com Contributors. Software engineers, also known as systems analysts, apply computer science and mathematical analysis principles to the development, design and assessment of computer systems and applications that enable computers to perform specific tasks.