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.

Who needs cable? Watch buzzworthy network shows, thrilling sports moments, breaking news, and more with our favorite live television streaming services. My PCMag career began in 2013 as an intern. Now ...

UC San Diego cognitive scientist Philip Guo created Python Tutor, a free tool that makes code “visible” step by step. The research behind it earned a Test of Time award, recog ...