Mr. Witt is the author of “The Radical Fund: How a Band of Visionaries and a Million Dollars Upended America.” As democracy in the United States spirals into a widening gyre of distrust, demagogy and ...

Though the principle is not violated, a new way of fudging its restrictions could lead to improvements in ultra-precise ...

Classical conditioning, also called Pavlovian conditioning or respondent conditioning, is learning through association. This behavioral learning method was first studied in the late 19th century by ...