An electromagnetic wave found throughout the plasmasphere; it removes high-energy electrons trapped by the Earth's magnetic field

(linguistics) The scientific study of language change.

Research performed using the historical method.

(historiography) The techniques and guidelines by which historians use primary sources and other evidence to research and then to write history.

Counterfactual history, a form of scientific speculation used by historians.

plural of hisingerite

(mineralogy) An iron silicate with a dark-brown or black color, formula Fe³⁺₂Si₂O₅(OH)₄·2H₂O.

(US, law) The record of the examination of a patent application, including the original application, responses made by the examiner, and amendments made by the applicant to address objections raised by the examiner.

Items such as covers and associated material illustrating historical episodes of postal systems.

Things that have happened in the past will or tend to happen again in one way or another.