3M（スリーエム）さんのインスタグラム動画 - (3M（スリーエム）Instagram)「Did you know about this tech that helped cell phones get smaller? 📱 I had no idea a big reason cell phones needed such big batteries was because of the energy needed to backlight all the keys! And if you’re old enough to have seen one of these cell phones in person - friendly reminder it’s probably time for us to stretch out our backs 😅 Thanks for having me at the Innovation Center, @3m! #science #scicomm #tech #cellphones #funfacts」11月22日 1時59分