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 ...

WASHINGTON — Charlie Kirk’s $4.75 million Spanish-style estate is tucked away in a gated Arizona country club that boasts a guest casita, “resort-style” pool and striking views of the Sonoran Desert.

WASHINGTON — The U.S. is concealing a longstanding program that retrieves and reverse engineers unidentified flying objects, a former Air Force intelligence officer testified Wednesday to Congress.