Engineering is the creative application of science, mathematical methods, and empirical evidence to the innovation, design, construction, operation and maintenance of structures, machines, materials, devices, systems, processes, and organizations. The discipline of engineering encompasses a broad range of more specialized fields of engineering, each with a more specific emphasis on particular areas of applied mathematics, applied science, and types of application. See glossary of engineering.
This is some materials of this apps;

- Compensation

- Crystallization

- Earthworks

- Exploratory engineering

- Fasteners

- Flexibility

- Freeze

- Gate

- Good Engineering Practice

- Hand tools

- Machine tools - Punch

- Measuring -- measurement

- Materials -- material science -- Tie