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Radio wave

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Radio waves (formerly called Hertzian waves) are a type of electromagnetic radiation with the low…

Kondratiev wave

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In economics, Kondratiev waves (also called supercycles, great surges, long waves, K-waves or the…

Microwave oven

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A microwave oven, or simply microwave, is an electric oven that heats and cooks food by exposing …

Third-wave feminism

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Third-wave feminism is a feminist movement that began in the early 1990s; it was prominent in the…

Second-wave feminism

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Second-wave feminism was a period of feminist activity that began in the early 1960s and lasted r…