a sudden change in the refractive index of a material for wavelengths in the vicinity of absorption bands in the spectrum of the material.
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Where and when did language begin? A remarkable new study may have the answer
The origin of spoken language has stumped linguistics dating as far back as the Twenty-sixth dynasty in Egypt and the first recorded language experiment conducted by a Pharaoh named Psammetichus I. While it is widely understood that our ability to communicate through speech sets us apart from other animals, language experts, historians and scientists can only hypothesize how, where and when it all began. Some new …
Origin of anomalous dispersion
First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019