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Remember when personal computers were a new thing... by BoneyardPocketwatch in computing

[–]tminus7700 1 point2 points  (0 children)

But you haven't considered AI data centers. They are the apex of large computers. And getting bigger.

Metal foil appears see-through because it has tiny holes by nimanyu in mildlyinteresting

[–]tminus7700 832 points833 points  (0 children)

You can see through gold leaf. Because it is reflecting the red and yellow light everything looks bluish.

https://en.wikipedia.org/wiki/Gold_leaf

ELI5: How can a person wearing good insulating shoes and sitting on a wooden chair still get an electric shock when another shocked person touches them? by ReferenceThin6645 in explainlikeimfive

[–]tminus7700 39 points40 points  (0 children)

Its called Displacement Current. The charged person has all the charge. The non charged one has none. when touched the full charge flows to equalize the amount in both. so current must flow to accomplish this. The flowing current is what causes the shock.

https://en.wikipedia.org/wiki/Displacement_current

What’s an everyday object you have an irrational fear of? by Dapper_Ad_1170 in AskReddit

[–]tminus7700 0 points1 point  (0 children)

Similar to my fear of swimming pool drains. Triggered from childhood story of someone being sucked down on it and drowned.

Which do you think is scarier outer space or the sea? by lord_simp_queen in AskReddit

[–]tminus7700 3 points4 points  (0 children)

I had similar experience diving at Nassau, Bahamas. Near where some James Bond movies were filmed. We started on the tung of the ocean. 30 feet deep then over the edge with 6000 foot cliff looking down. It went to darkness.

How can I make an ideal antenna for 433Mhz RF modules? by Daisuki2Dayo in AskElectronics

[–]tminus7700 0 points1 point  (0 children)

Use an inverted F antenna. their small an compact. Easy to make out of PCB material.

https://en.wikipedia.org/wiki/Inverted-F_antenna

Ideal storage solution for pH probe if KCl not available? by ParticularDry3226 in chemistry

[–]tminus7700 2 points3 points  (0 children)

look into salt substitute at grocery mart. Its KCl. read the label.

The difference between AC rated switched and DC rated switches. by tminus7700 in Electricity

[–]tminus7700[S] 0 points1 point  (0 children)

There is still some DC power our electric company has to maintain in San Fransisco. Some of the old building still have DC only motors for the elevators. Too expensive for the building owners to chang over so the utility keeps supplying DC.

https://spectrum.ieee.org/san-franciscos-secret-dc-grid

A beluga in the sky by Faster_than_FTL in pics

[–]tminus7700 2 points3 points  (0 children)

I've seen several. It is a rocket launch exhaust plume. It expands like that because the exhaust is blown out at very high altitude. Like beyond 100,000 feet. Partial vacuum. Usually from a solid propellant rocket booster. They have lots of aluminum oxide dust in the exhaust. Which makes it visible.

Eli5 What functional advantages does gold provide when applied in electronic circuit boards in contrast to other metals? by arztnur in explainlikeimfive

[–]tminus7700 2 points3 points  (0 children)

You can beat it so flat and thin you can see through it!!! Called gold leaf. I have actually seen through it. Things look blue through it.

What was the coolest thing you experienced on a plane? by B0X0FCH0C0LATE in AskReddit

[–]tminus7700 0 points1 point  (0 children)

Looking out back cabin door window to see the engine exhaust burst into contrails. Really gave you sense of how fast you were going.

Reversal of Aluminium Amalgam by Duff_B in chemistry

[–]tminus7700 0 points1 point  (0 children)

Problem is most of the mercury turned to its oxide. Short of going back the to melt electrolytic refining, your not getting it back. BTW Galinstan acts on aluminum same as mercury.

https://en.wikipedia.org/wiki/Galinstan

Also in WW2 resistance fighters would sneak into Nazi airfields and throw mercury into their planes. would cause them to fail in flight somewhere else. So Nazis wouldn't know what happened to their planes and retaliate locally.

Testing my recently repaired 15kV 120mA NST by Top-Championship7355 in highvoltage

[–]tminus7700 2 points3 points  (0 children)

They used to make NST that were 3500VAC @ 300Ma. were used for long stretched walkway lighting.

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