Abstract: Programmable pocket calculators of the mid-1970s opened up a new segment of the personal computing devices market. Calculator users established clubs, magazines, and conferences, and their ...

The National Academies of Sciences, Engineering, and Medicine are private, nonprofit institutions that provide expert advice on some of the most pressing challenges facing the nation and world. Our ...

We’re all familiar with the sun’s daily motion in the sky. It rises in the east, gets higher in the sky until circa noon, then begins its hours-long descent to set on the western horizon. You may also ...