Teach Yourself to Echolocate: A beginner’s guide to navigating with sound

is this a serious comment?

i am not that old and not that young, and VR has been "around the corner" for 10 to 15 years already. even with all the hype and the amount of people that have been feverishly working on it, there's basically nothing to show for it. it will come eventually, but not in any useful form anytime soon.

what does moore's law have to do with ease of programming?

blockchain has no relevance to the common person.

I think you're totally right that it feels like that wonderful old Web, the one that felt like a magical place, a weird place, seems to have vanished.

For me, some of that's moved on to YouTube. Even today, I find channels full of crazy stuff, brilliant stuff, beautiful stuff, educational stuff, stuff I'd never even heard before, just randomly stumbling around. It's hard to find them, what with the suggestions throwing only the lowest-common-denominator version of the stuff I get baited into clicking on, but sometimes I manage to run across it.

Very good point! I happen to roll down windows every time I start up my car for another reason (the air trapped inside the car while it's parked, probably under sunshine, doesn't feel great to breathe in), but you're totally right that the sound gives a lot more clues than just seeing, when backing out of a spot.

"the time for jacking around with Tesla coils and ball lightning in the garage is over." -Abe, PRIMER

Few additions http://amasci.com/news.html The Trafficwaves article made the WSJ, even with video. And Crown Flash (leaping sundogs) is now all over the place (see my upcoming bit on TV show Strange Evidence.) Magnetic analogy: https://www.youtube.com/watch?v=tH-CAhtXBfQ

Fortunately (unfortunately?) I only posted examples of my somewhat-kid-friendly magic. Nobody died in microwave oven accidents. That plus a couple of minor inventions (made public as a test to see how fast the idea-thieves would pounce on them.) None of my frightening demos using vacuum pumps and Spellman supplies. Well, I guess I did write about our hypergun which fired a small plastic slug through a clay block twelve inches thick (a spinoff of the very first quarter-shrinker capacitor bank,) and no little kids yet tried building one: http://amasci.com/amateur/capexpt.html#shrink

An unexamined backwater is at http://amasci.com/weird/wtext.html

I still haven't tried out the giant version of Lord Armstrong's water-bridge, from an eyewitness report where a liquid "snake" several feet thick was extending itself thousands of feet across desert land during a thunderstorm. If such things are possible, then an HV supply of a few hundred watts and a couple hundred kilovolts should produce something similar (the recent water-bridge experiments use 10 to 20KV supplies at under ten watts, a 2cm bridge, a mm or two in diameter.) Rainwater or ddw on very clean sand? Needs a big Cockroft-Walton diode stack http://amasci.com/freenrg/wasser.html

And the infamous invisible wall at the 3M factory, recently someone claims to have seen an example caused by electrodes connected to a reversed pole-pig transformer, where coins would bounce off the empty space. This is silghtly conceivable: a corona in air may develop a stable annular double-layer with a significant space-charge and pressure-gradient of air. But would a metal object bounce off? Or just short it out? Plasmas do tend to avoid cold bulk metal surfaces (Tesla managed to make an opaque "neon sign" with a metal tube rather than glass, but skeptics refused to believe it was real. The plasma in near-vacuum can travel many inches through thin metal tubes without leaping to the metal! Try it, it's really weird: pipes full of glowing "electricity" rather than water.)

Speaking of PRIMER, did they actually base the plot on meissner maglev "null coils," placed in a circle rather than parallel rows? Then, put it all inside a "One Atmosphere Plasma Globe" full of argon? But then, where do platinum catalytic converters figure in that? Or maybe they were just huddling inside a styrofoam version of the USS Eldridge hull, covered with active magnetic shielding coils, but not turning invisible.

:)

It definitely does. I've practiced this a little myself and in louder environments you need a louder click. On the other hand, ambient noise can give rich information about close obstacles without yourself or that object needing to actively make any noise.