/sci/ - Science & Math

>>16122714
What Elon said was that Starlink is now "Operating Cash Flow Positive". Anyone with an undergraduate level of finance knowledge knows what that means: Starlink is now scaled to pay ongoing costs but doesn't yet pay for the costs to launch or build the satelites. Not sure why WSJ is confused over this.

>>16078385
Interesting.
Damn I wish they'd explain these sorts of things in their stream instead of emoting and showing us pies.
They had people's attention for almost an hour and they said very little.

>>15680037
>Four earthly elements
>Fire
>Air
>Earth
>Water

None of those are elements, they are compounds and fire isn't even anything, it's just the energy released from the covalent bonds forming with the oxygen element.

I'm suprised that liquid ammonia has been ignored so long as a rocket propellant.

It has performance similar to methalox, but unlike the latter it produces no carbon in the combustion process.

It could also be a great alternative to jet fuel.

Why isn't ammonia (NH3) used more commonly as rocket fuel?

It can be stored at room temperature (under pressure), and contains no carbon so it doesn't produce soot when burned fuel rich.

Specifically, I'm pondering the use of either ammonox (ammonia and liquid oxygen), or ammonia burned with nitrogen dioxide (NO2) oxidizer.

how do I analyze my DNA, fellow /sci/entists? jewgle and jewtube keep giving me companies that would do it for me and I wanna do it myself. also price of equipment would be lovely.

somtimes when i go poopoo I hold my weewee than i stand up and weewee on my poopoo, this releases a very smelly smell Whut is happening here chemically? is the amonium in my weewee reacting with the poos somehow?

discuss

>>14771343
1kg of mercury (gold) minus electrons≈tiny bit of gold

Totally doable but would not be worth the time and effort.

I am studying French

>>12798058
>>12798096
Honestly if you want to compete with a Starship clone a lot earlier than 2040 I wonder if it would be better to design a cheap, easy to build, and fully expendable version before sinking in development for reusability.
Even if Starship was fully expendable it would be a groundbreaking achievement.

>>12790575
Realistically the reason a lot of the time why it's hard to learn things in school is that you are limited by time. With enough time any topic or subject becomes attainable. You can do it, anon. Achieve enlightenment in the ways of Algebra.

>pour peroxide in waste bottle
>it starts fuming
>wasn't H2O2 waste
>just put the waste bottle back where it was

What does it mean if I'm good at numbers (can understand things very well when expressed solely in numbers) and awful in scientific abstracts? Are there any studies where I could fit in easily?

Has anyone here worked in the Pharma/Biotech industry? What is it like? Would you recommend it?

>>12700050
So what happens after they nail the 10km bellyflop? Do they do it again at 100km suborbital is Starship is able to get that high? Start testing the heat shields?

>Make an embryonic clone of yourself and implant it in a womans uterus (like what was done with Dolly the sheep)
>Suppress the hox-genes responsible for making the head segment in the developing embryo
>It never develops a head
>When it is birthed, hook it up to some nutrition via IV
>Administer the correct hormones as it grows and let it grow to 16-18 years old
And voila, you have a genetically identical organ bank that you can also transplant your head onto if you want a younger body.

Could this actually work in practice eventually?

>>12675485
Is the Soyuz craft REALLY that good or does the long use come from Roscosmos being virtually bankrupt and unable to innovate?

>All my friends in my PhD cohort get handed projects that help them build their thesis
>My PI basically threw me to the wolves and said "figure it out"
I know fundamentally figuring it out is the whole MO of the PhD, but I can't help but feel at a major disadvantage. All I'm handed is past literature and dissertations from earlier students; I haven't the slightest clue how to develop a tangible project from this. It feels like being handed some wood and carpentry screws and then getting told to build a house. Sorry for the rant, It's just that I always assumed the PhD was a means of teaching students how to be better scientists, yet the entire didactic portion of the PhD was just an extension on the didactic teachings of undergrad.

be careful fren, if you take two vaccines and they have 60% efficiency each then you overshoot the ideal dosage by 20% and then you get 20% of autism on top of what you already have

>use HF in lab all day
>go home
>take magnesium supplement just in case

Would it even be possible to design an upgraded AJ-10?

>>12499852
Just knowing that landing boosters is POSSIBLE cuts down on R&D for everyone else.
So instead of SpaceX being 20 years ahead of everyone else they are now only 15 years ahead.
Until Starship becomes online then SpaceX becomes half a century ahead.

Has anyone read that one guy's paper on "error correcting codes" he found in String Theory? Is it bullshit?

>>12485774
>Ah darn the ol' space ship tipped over
>Better buff that out and replace the flap
>Okay we're ready to go!
vs
>oopsie whoopsie we forgot how to fuel up the orangetank
>we need another month and 20 million to fix this