Father, husband, graduate student. Interested in mechatronics and discussing the future of civilization.
Joined 32w ago. Seen 1w ago.
running an entire data center to mine cryptocurrencies should be an environmental crime. If a rule like that were enforced globally, people would eventually innovate and come up with a "green" bitcoin.
Four years into my graduate program and I just find out that inkscape has a "diagram connectors" feature. I've spent so much time designing block diagrams by hand!
I hate how in the US we have to buy medical "insurance". Insurance makes sense for things likes cars and houses, not humans. Cars don't have chronic problems or syndromes. Cars don't have preexisting conditions (you normally get a factory warranty). If a car is beyond repair, you eventually get a new one and move on. I think making something as complex as healthcare fit the shape of insurance is dehumanizing.
US is the only developed country to lack access to universal healthcare, right.
My hobby: finding words that fit to arbitrary rules for no reason. Examples: words that contain all five major vowels (evacuation), long words that have only one vowel multiple times (stronghold), words in which the singular form ends in S (species). I like to do that in Portuguese and English... I don't know, it's just fun.
Sounds like you might enjoy Oulipo word/writing games. They are also called constraints. languageisavirus.c...
You should play scrabble!
People say that capitalism has failed us, but capitalism's goal was never to please us in the first place. We failed to give capitalism the right cost function to optimize for. I think a good way to steer the optimization is to introduce penalties for undesirable behavior. That is, taxes! In the US we tax income, property, and profit. Unsurprisingly, the wealthy have found ways to hide all of those. We should tax wealth directly and carbon, sugar, empty apartments, etc
Feeling super happy. I just found a reference that says _exactly_ what I want to claim in a paper: electric motors are getting better thanks to multiphysics simulation. Thank you IEEE! spectrum.ieee.org/...
Nice! What paper are you trying to write?
Today a colleague told me about a potential unintended consequence of the gradual adoption of electric cars. By the point a significant number of drivers stop buying gas, the economies of scale that we have in place right now will no longer apply, and price will rise. The problem is mostly wealthy people will own electric cars, and mostly poor people will be stuck with old combustion engines and unaffordable fuel.
Cars get old. Wealthier people can afford chasing the next shiny thing, so they move on to newer models. That increasingly creates a market for used electric cars. Prices drop with increased supply. That then triggers demand. And as this trend starts gaining momentum, the market grows exponentially. The same is true with the reverse. As the ICE market shrinks, the availability of models and parts also shrinks. That increases the prices. Higher prices lowers demand. Etc.
Brazil now has a $200 bill. The latest Brazilian money, the Real, was introduced in 1994. So far, the largest bill was $100. In 26 years, an inflation of about 2.7% per year would have caused the currency to lose half of its value. The actual annual inflation rate has been at least twice that. So, in practical terms, a $200 bill makes sense... but I still don't like it.
It doesn't tickle my fancy either. The bill was released in the capital cities yesterday. Haven't seen one yet.
Reminds me of the 100 trillion bill from Zimbabwe :p
two thoughts on existential crises. 1. I should feel lucky that I have the luxury of going down existential rabbit holes, contemplating my own existance and purpose; I don't have to worry much about food or shelter. It would be great if everyone could have that privilege. 2. Existential crises are extremely counterproductive given any sort of material goal. Want to go to Mars? Sitting there and contemplating your existence will not take you there.
Although mental fortitude and inner peace will give you the ability to be content and happy regardless of the outcome of a "material goal"..
1. Either that or you are a philosoper, where going down the existential rabbit hole is an art and trade. I'm on that camp.
Related to subreply.com/trohs... if you leave your fridge open, your kitchen will actually get warmer because the compressor would be running non-stop. The refrigeration system is just moving energy (heat) from inside the fridge to the outside. That's why AC units must have a portion outside, so heat can be moved out of the house.
As an engineer you quickly learn to appreciate how any dynamic system is just a series of energy connections. For example: any driver knows what the brake pedal does; a technician understands how it works, with the caliper pressing the pads against the disc; an engineer, however, understands that deceleration is nothing but a conversion of energy: from kinetic to heat. The car will lose velocity by the same rate as the brakes heat up. Power simply has to go somewhere.
As an engineer I'va always been confused about potential energies though.
This reminds of the tale of the pitcher who got hit by a line drive right on the head and the ball bounced of his head and flew up to the highest seats in the stadium. A physics professor watching exclaimed: "He is going to be fine".
> "Power simply has to go somewhere". Politicians take that observation very seriously!
I like the idea of exoskeletons for rehabilitation (e.g. make paraplegic people walk again) but I dislike human enhancement stuff. Why use an exoskeleton to lift 1000 lbs? Just use a remote controlled robot, or a fork lift! Want to run at 60 mph? Use a car! Just imagine if something goes wrong with the control system or the freaking battery connector fails while the user is lifting 1000 lbs above their head.
That's a very grounded argument you have there. Never thought it like that before. And it makes much sense once you think about it from a practical point of view. All tech fails at some point. And your scenarios, though focusing on very fringe instances, are entirely within the realm of possibility.
it annoys me that I can at least pretend to intuitively understand springs and dampers (friction) but I don't get why inertia exists. Sure, it's a fundamental law, Newton's 2nd, D'Alembert's principle, varies kinetic energy, etc. No idea why the universe decided to work in that manner. If masses warp space, why does it take force to accelerate mass but not to keep it going?
My native language, Portuguese, has a cool feature that English doesn't have. The word "ai" pronounced ah-ee means "there where you are". It pretty much can only be used in conversation. I like it because, unlike "there", it is completely unambiguous. Another cool feature: days of the week are just numbers. Monday is 2nd, Tuesday is 3rd, ... Friday is 6th.
Which complicates things for foreigners, figuring out the difference between ai, ali, and la ...
You're right about the days of the week being counted from Sunday, the Lord's day. I actually don't like the way we name it precisely because it breaks with a much older tradition of naming them as the old gods. More info here: pt.wikipedia.org/w...
Op-amps (and by extension in-amps) are amazing devices. Recently, when debugging an analog circuit, I noticed that the output of a buffer was measuring half Vdd with the input floating. However, when I tried to measure the voltage at the input I could only read zero. The cool part is the output of the op-amp would also swing to ground when I was reading the input. It turns out the generic op-amp has higher input impedance than my multimeter, which pulled down the input.
I really doubt we will have people on the moon by 2024, as is the current plan. And that's if they don't end up canceling the Artemis program due to coronavirus related budget cuts.
Doubt it as well. If canceled it will probably be for political reasons depending on the next election results... Then the mission architecture itself is pretty bloated w/the orbital gateway, sinking further billions (SLS delta-V not able to reach the Moon, just the station in its orbit). And I'm not sure Moon direct missions will be done initially, you have to justify the use of the SLS/gateway. The good part is the international co-op. 2024 is a tight time frame indeed...
Guy is crazy, so I believe him: Elon Musk(2019): "Well, this is gonna sound pretty crazy, but I think we could land on the moon in less than two years. Certainly with an uncrewed vehicle I believe we could land on the moon in two years. So then maybe within a year or two of that we could be sending crew. I would say four years at the outside."..."If it were to take longer to convince NASA and the authorities that we can do it versus just doing it, then we might just do it."