Alphabet Inc.’s Waymo is launching a new account type that lets teenagers hail a robotaxi and ride alone, expanding its rider base while continuing to test its service in more U.S. cities.

More affordable than ever, 3D printers are booming for personal, professional, and educational use. Here's everything to know before you buy one, along with the top models from our hands-on testing.

Abstract: We address the problem of constructing an adaptive arithmetic code in the case where the source alphabet is large and there are lots of different symbols with equal counts of occurrence. For ...

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