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.
Homer simpson. Civil engineers are the most different of the mentioned, they typically design public works, such as power grids, roads, bridges, water/sewer systems. Software engineers/Computer science majors usually work exclusively on software, and are rarely concerned with the more tangible parts of the machine. They're the ones that wrote Microsoft Windows.