LOX is liquid oxygen, which is not a fuel, but an oxidizer. Starship is fueled by liquid methane. Methane can not be made from just water, you need a source of carbon. On Mars for example methane could be produced from CO2 in the atmosphere and water from ice.
YouTube video ads can’t be blocked with just DNS blocking unfortunately, they are served from the same hosts as YouTube videos.
I think “popular” is stretching it here, Debian GNU/kFreeBSD is dead now, and while Hurd is interesting, it has ways to go.
Alpine is actually popular, particularly as a lightweight host OS to run docker.
You can have a Linux distro without GNU -Alpine Linux is a popular example
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Chinese is also not right - 正确的 (zhèngquè de) means “proper”
Left and Right as the sides are 左 (zuǒ) and 右 (yòu) - you can also add 邊 (biān) to each which means “side” to be more explicit, but they are also used separately in many contexts where the left/right meaning is needed.
The Chinese characters for 左 and 右 actually originated as pictograms of the left and right hand in the early forms of Chinese writing, but later forms both contain general “hand” component (𠂇) with components 工 and 口 added for differentiation
What’s wrong with using a text editor to remove lines ? In vim for example :g/pattern/d or :g!/pattern/d with regular expressions is a powerful tool for removing lines in bulk if needed.
The first computer I used was a PDP-8 clone, which was a very primitive machine by today’s standards - it only had 4k words of RAM (hand-made magnetic core memory !) - you could actually do simple programming tasks (such as short sequences of code to load software from paper tape) by entering machine code directly into memory by flipping mechanical switches on the front panel of the machine for individual bits (for data and memory addresses)
You could also write assembly code on paper, and then convert it into machine code by hand, and manually punch the resulting code sequence onto paper tape to then load into the machine (we had a manual paper punching device for this purpose)
Even with only 4k words of RAM, there were actually multiple assemblers and even compilers and interpreters available for the PDP-8 (FOCAL, FORTRAN, PASCAL, BASIC) - we only had a teletype interface (that printed output on paper), no monitor/terminal, so editing code on the machine itself was challenging, although there was a line editor which you could use, generally to enter programs you wrote on paper beforehand.
Writing assembly code is not actually the same as writing straight machine code - assemblers actually do provide a very useful layer of abstraction, such as function calls, symbolic addressing, variables, etc. - instead of having to always specify memory locations, you could use names to refer to jump points/loops, variables, functions, etc. - the assembler would then convert those into specific addresses as needed, so a small change of code or data structures wouldn’t require huge manual process of recalculating all the memory locations as a result, it’s all done automatically by the assembler.
So yeah, writing assembly code is still a lot easier than writing direct machine code - even when assembling by hand, you would generally start with assembly code, and just do the extra work that an assembler would do, but by hand.
The kids always adapt though.
There is a strong survivorship bias in this though. Some kids do adapt, maybe even most, but many still are harmed, and have been by unhealthy exposure to radio, television, videogames, etc. in the past. Social media is even wreaking havoc in the older generations right now.
It’s easy to point at the survivors and the success stories and say see, there is nothing to worry about - but that’s also a bit like pointing at the lifelong smokers who do not get lung cancer as an argument against promoting non-smoking.
The only fuel you can make from water is hydrogen. The RS-25 engines used on the SLS core stage and the Space Shuttle used liquid hydrogen, as did the J-2 engines on the second and third stage of the Saturn V (but not the first stage, which used RP-1 (kerosene) burning F-1 engine)
Starship’s Raptor engines use liquid methane however. There are a bunch of tradeoffs between the different fuels, but generally liquid hydrogen is more difficult and expensive to deal with. With low cost reusability being one of the primary objectives of Starship, liquid methane was chosen as the best option. The fact that it can also be manufactured on Mars was also considered, since CO2 is abundant in Martian atmosphere.