The new TI-84 keeps the good old-fashioned physical buttons. Texas Instruments Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent six days a week. In a world drowning in notifications and devices that want to be everything all at once, calculator giant Texas Instruments (TI) is going back to basics. This week, the company unveiled the TI-84 Evo , its most powerful graphing calculator ever. It explicitly can’t access social media apps or even connect to Wi-Fi. Instead, TI says its $160 “distraction free” device is designed to do only one thing exceptionally well: math.  That’s likely welcome news to educators around the country battling a growing attention crisis in classrooms some attribute to constantly nagging smart electronic devices.  The TI-84 Evo costs $160 and comes in a variety of colors. Image: Texas Instruments.…