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Without unnecessary brand name dropping, what current technology blows you away?
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White LEDs. Having a light bulb that can last for decades an consume very little electricity is pretty cool.
LEDs kind of blow me away in general. People will look back at this period and be like, "they sure did love putting LED lights on top of and on the sides of their skyscrapers just for show".
I never used to use my phone's flashlight function because it's so bright, I assumed it would suck the battery dry. But recently I had it on for like 15 minutes and it only used up one or two percent. Amazing.