The X Half is flying off shelves, but using it made me nostalgic for the company's old-school X20. I had to track one down to see how it holds up.

This is one of my favorite card color changes ever—and it uses fire! In this tutorial, I’ll show you how to perform a fast, mind-blowing card trick with flash paper that’s easy to learn and guaranteed ...

Abstract: This research introduces a novel circularly polarized compact antenna designed for universal ultrahigh-frequency (UHF) radio-frequency identification (RFID) handheld readers for ...