The simplest form of it is the development and use of basic tools. The prehistoric discovery of how to control fire and the later Neolithic Revolution increased the available sources of food and the invention of the wheel helped humans to travel in and control their environment. Developments in historic times, including the printing press, the telephone, and the Internet, have lessened physical barriers to communication and allowed humans to interact freely on a global scale. The steady progress of military technology has brought weapons of ever-increasing destructive power, from clubs to nuclear weapons.
Tangible: blueprints, models, operating manuals, prototypes. Intangible: consultancy, problem-solving, and training methods. High: entirely or almost entirely automated and intelligent technology that manipulates ever finer matter and ever powerful forces. Intermediate: semiautomated partially intelligent technology that manipulates refined matter and medium level forces. Low: labor-intensive that manipulates only coarse or gross matter and weaker forces.