While technology contributes to economic development and human prosperity, it can also have negative impacts like pollution or resource depletion, or cause social harms like technological unemployment caused by automation. Recent technological developments, including the printing press, the telephone, and the Internet have lowered communication barriers and ushered in the knowledge economy. The invention of the wheel in the Bronze Age enabled wider travel and the creation of more complex machines. The earliest known technology is the stone tool, used in the prehistoric era, followed by fire use, which contributed to the growth of the human brain and the development of language in the Ice Age. Many technological advancements have led to societal changes.
Technologies include physical objects like utensils or machines and intangible tools such as software. : 117 The use of technology is widely prevalent in medicine, science, industry, communication, transportation, and daily life. The word technology may also mean the product of such an endeavor. Technology is the application of knowledge to reach practical goals in a specifiable and reproducible way.
A steam turbine with the case opened, an example of energy technology
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