Alis451

Alis451 t1_jdhs8x8 wrote

usually there are shelter "lifers", ones with complex health/medical requirements that don't lend to adoption easily or readily. Not saying they can't be, but some things are a bit complicated. We have one cat that allegedly got brain damage from a flea collar, he kind of runs in circles, but the other cats in his room take care of him and don't let anyone bully him.

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Alis451 t1_j0ghvj9 wrote

>how free fall could be distinguished from 0 gravity.

The Space station is at 0g, but they aren't far enough outside of the Earth's Gravity well to be at Zero Gravity, because if it were it would start sticking itself, Earth's Gravity supersedes your own in relation to other nearby objects. So YES, there is a VAST difference between 0g and Zero Gravity. The space station is in a constant freefall and needs to continuously adjust.

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Alis451 t1_j0ghk8i wrote

The Space station is at 0g, but they aren't far enough outside of the Earth's Gravity well to be at Zero Gravity, because if it were it would start sticking itself, Earth's Gravity supersedes your own in relation to other nearby objects. So YES, there is a VAST difference between 0g and Zero Gravity. The space station is in a constant freefall and needs to continuously adjust.

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Alis451 t1_ix0x93u wrote

The ocean captures carbon as well in the form of carbonic acid that then is removed by shellfish in the form of Calcium Carbonate. Over years of life they die leaving their shell to break down and build up into sediment rock, known as Limestone, which is then mined and used as ingredient for cement. Side note: Limestone that has been heated and pressurized becomes Marble.

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Alis451 t1_iws0fmv wrote

> I mean, is water heavier than gasoline?

very much

>Hydrogen is measured by the kilogram. 1 kilogram is 1 gallon of gasoline equivalent (gge).

>It takes 3 gallons of water to make 1 kg of hydrogen

Water is 3.79 kg per gallon
Gasoline is 2.567 kg per gallon

water x3 = 11.37 kg of water to equal an equivalent amount of hydrogen energy as 2.567 kg of gasoline

or nearly 5 times the fuel weight

Usual Capacity is ~12 gallons of gas, so ~30kg (x5 = 150kg and a 36 gallon tank to hold it) basically trucking around a whole extra fat person 120kg = ~250 lbs, again not accounting for the electrolysis equipment, and the base energy you need to actually perform said electrolysis while on a vehicle.. it starts adding up fast.

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Alis451 t1_iwry9vy wrote

> Then all you need for fuel is... water...

water is super heavy and not very hydrogen dense, much unlike hydrocarbons, you are now back to the too heavy thing you are trying to prevent. also adding an electrolysis device TO the vehicle won't exactly... work. especially when you are trying to harvest green energy, from you know... solar/wind/etc. power plants.

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Alis451 t1_iwr1a5l wrote

> They worked out how to store 1H as a solid

MgH2, Magnesium Hydride was the last solid hydrogen storage medium that I saw they were working on. The problem is that it is solid, which makes it a terrible refueling storage medium, you need a liquid(like gasoline) or a gas that can be safely condensed(like propane), solids are difficult to extract the energy back out from, though not impossible, especially if they sublime under heat or are able to be activated while in a solution.

Palladium is also a fantastic Hydrogen storage device, with being able to store up to 900x its volume in hydrogen or something like that, palladium is already expensive for its unique properties and uses in catalytic converters.

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Alis451 t1_iwqj938 wrote

What he means is that there isn't currently enough Green Hydrogen throughput for all vehicles to run on Hydrogen, not even enough if all current EVs were converted to Hydrogen. Most of the current hydrogen fuel is Blue Hydrogen.

>Which is currently just not possible, but maybe in the future.

The biggest problem I have with Hydrogen is that it is super difficult to actually store, it is a slippery little bastard, so it doesn't make the best energy storage medium.

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Alis451 t1_ivfbhh4 wrote

> a certified architect.

certified engineer, not architect. architects are designers, engineers are the developers. Architect is "Where it goes", Engineer is "How it works". My brother had a collapsing column in his crawl space and needed an engineer to come assess in order to get a permit.

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Alis451 t1_iuj47xy wrote

This is the correct answer. There is no other magical locking device that can lock from the outside without some sort of alterations, to the door or otherwise. (barring some rube goldbergesque contraption)

Alternatively, ask your landlord to install a deadbolt. If you don't feel safe where you are, leave.

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Alis451 t1_iu5nqqc wrote

50 is the bare minimum to prevent inbreeding related genetic depression naturally. With new genetic technologies and extensive breeding program you can do it with 2, there are MANY thought examples out there where they talk about how bad it would be to try to do this naturally, this video does discuss using genetic mapping to prevent mismatches, there are a few that discuss it being possible naturally but requiring tens or hundreds of thousands of years to work out.

Interstellar used this thought experiment, though instead with 1 women and 5,000 frozen embryos, with strict genetic selection as well, i think to ensure only daughters were born for the first few generations.

Basically a lot of stuff to dig through that just talks about dangers, but not many that actually discuss the actual possibility, and with modern gene editing, the answer is "yes, but..." and depends on the access one would have to said technology. I think I saw somewhere strict genetic control and breeding control for 19 generations(~400 years) to get suitable genetic drift to be strangers again, of which you could get 50 from that would be able to satisfy the bare minimum of stable natural population.

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Alis451 t1_iu4ot73 wrote

> continue a species.

does not mean without defects, you can definitely continue a species(with defects) for a very long time. Though with proper genetic testing and mating protocol you can restart a human population from just 2 people, but it would take something like 19 generations to provide enough genetic diversity to become strangers again.

The quoted 50 population required is the "safe" number where you don't have to do a lot of genetic testing, nor would you be required to sire ~20ish children per generation.

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