What is something that's crazier than the wildest dreams of any ~1970s nerd, but exists today? I'll start with an easy one:

Ultrabright LEDs

They were d a r k back then.

Fascinating to see THIS comment (of all the million miracles in tech since then). I’ve always been weirdly attracted by those tiny lamps. As a kid I had a box with like thousands of LEDs of all kinds. I built even weirder things with them, like glasses hooked into the 6.3mm audio-jack that drove many LEDs around the eyes, in sync to the music. I didn’t need drugs as a wee lad 😁

Never thought they would ever need cooling in the future and can burn your eyes. Obsession with them didn’t fade though, all other tech just catched up to them in obsession-land.

I looked at making the leftt-right LED bar, hooked to binaural beats :-)

I mentioned this innovation because of how ever present they are now.

The planetary power-saving by moving from incandescent to LED for most light sources, must be staggering.