281–290 of 583 posts
How about electromechanical relay switch. As far as digital electronics goes, relay can, with some mental gymnastics, be considered grandfather of transistor (which, in turn, is one of the most important inventions of all time, but too complicated).
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> the number of hours saved by Washing machines and Dishwashers. This is true, but to some extent over-stated I think. We have a family of five, and don't use our dishwasher. I just do the dishes every morning while I listen to the news on the radio. It takes less than an hour. As far as washing machines, I agree that they are quite convenient, but the truth is most clothing doesn't need to be washed nearly so often…
> ... but the truth is most clothing doesn't need to be washed nearly so often as people do. Didn't exactly understand you ... I mean, I can't wear any shirt more than two days in a row before it picks up my body odour and starts stinking (India; hot climate - and this is after 2 baths a day too; no deodorant). So if I don't wash and wear it, I am pretty sure it would bother a lot of people. I can wear pants and trou…
Other clothing items I go through more quickly, but I'm planning to start giving my undershirts a couple rotations before washing them as well. Same with socks.
The main thing I've noticed is that natural fabrics don't pick up smells nearly as badly as synthetics.
Also just letting things hang and air out seems to keep everything smelling pretty fresh. If I go out of town and leave clothes in my backpack they need washed when I get home whether I wore them or not.
Finally, I think odors are largely based on your skin biome and genetic factors, and fortunately for me, I just don't get that smelly.
3D printing. I know, I know - overhyped. But you know what's a funny thing? It's incredibly basic tech. Stepper motors and thermoplastic. We could have had something like it at pretty much any time over the past century, and in its modern form from about 1960 or so. It has unquestionably revolutionized prototyping and short-run manufacturing, and we just didn't think of it . The idea was just too zany and expensive -…
Metal 3d printing is a different story, if that gets cheap enough it will be a real game changer. It's very expensive to make metal parts from solid and you can't use casting except for certain metals. If you could 3d print accurate steel parts cheaply and quickly it could actually replace expensive deductive production processes.
The surface plate. Modern precision all stems from the concept of a flat reference. However, the technique to make a surface as flat as possible (which is based on simple geometry) was first discussed in the early 19th c. In terms of profound impact on modernity, the metal screw-cutting lathe.
Ingenious Mechanism + strong as hell
I have used them for the last 45 years in the same shape and form.
If you gave me any of the "older" models from 40 years ago, the utility value will be similar to what I buy from the store today.
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"The earliest recorded evidence of the production of soap-like materials dates back to around 2800 BC in ancient Babylon." [1] Soap is not a modern invention and its usefulness in cleaning was recognized way before modern knowledge about diseases. [1] https://en.wikipedia.org/wiki/Soap#Ancient_Middle_East
And arguably, soaps available in shops are getting worse with every iteration. Enter a big store in most of the developed world, and you can hardly find a regular soap bar anymore (only liquids, "hydrating bars", etc.). Craft markets still have them luckily.
Refrigeration, particularly because it has revolutionized our food infrastructure.