Despite all the phones and tablets out there, Texas Instruments' graphing calculators continue to survive. The company's latest classroom tool even turns them into a device that can teach kids coding and engineering. TI-Innovator Hub plugs into the company's graphing calculators a lot of middle- and high-school students already have. It's a palm-sized board with a microcontroller that gives kids a way to build simple engineering projects. They could make LEDs light up, play notes or make small toys move by plugging the components into the hub and writing a program on the calculator.