Happy National Pretend to Be a Time Traveler Day! If you’re still puzzling over what to wear for this momentous occasion, can we suggest accessorizing with an item no retro #MTU students were without: the slide rule. Way before TI-89s, cell phones, and computers were ubiquitous, slide rules were essential for math, computing, engineering, and, well, most courses at Tech. Students had love-hate relationships with them, though now, through the lens of time, slide rules have a special place in the hearts of alumni (and a dedicated MTU webpage to celebrate them.