“Ingenuity,” a four-pound helicopter carried to Mars on NASA's “Perseverance” lander/rover, made the first powered, controlled flight on another planet April 19, achieving an altitude of 10 feet. Four more flights, going as high as 50 meters high and 600 meters away, are planned in ...
In the midst of nationwide protests and the tearing down of Confederate statues last year, President Donald J. Trump promised to build a “National Garden of American Heroes.” On Jan. 18, he revised his July executive order and listed out the luminaries he hopes to ...