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/sci/ - Science, Technology, Engineering, and Mathematics

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Sci-fi 20/Traveller 20 rule book PDF Anonymous 15/10/04(Sun)23:42 No. 16212 ID: 592535 [Reply]

Youtube  Me and a couple friends are looking for the PDF collections of Sci-Fi 20 and Traveller 20 roleplaying games.

Could anybody lend us a hand?

Chemistry Anonymous 18/10/22(Mon)12:42 No. 16713 ID: eb4831 [Reply]

File 154020494560.png - (174.49KB , 737x758 , 1523914422256.png )

Alright, so some dude is trying to determine the atomic mass of 3g Tellur and ends up with 3,475 TeO2. How big is the relative atomic mass of Tellur (atom. mass of O = 16)

Anonymous 18/11/25(Sun)08:56 No. 16730 ID: d40656

> 3,475 TeO2
3475 g? mol? molocules? Need a unit to solve

silver fulminate Anonymous 18/10/13(Sat)03:31 No. 16705 ID: 418128 [Reply]

File 153939426166.jpg - (505.94KB , 1920x1080 , 1478896995581.jpg )

It is not called a "high explosive" for nothing. I Saw a video on YT of a guy gripping a chunk and throwing it.. I was not so lucky. Mine just blew up on my desk from the slightest friction!

Anonymous 18/10/13(Sat)03:45 No. 16706 ID: b5377a

File 153939514559.png - (83.72KB , 200x200 , tmp_23685-1111111112073029071.png )

You should blow up a police station.

Anonymous 19/03/04(Mon)17:22 No. 16755 ID: bafe83

it is interesting for me too

Anonymous 19/03/04(Mon)17:24 No. 16756 ID: bafe83

You can use silver fulminate for your laboratory research. But now more popular became using nanomaterials in science. For example, graphene, fullerenes now use in electronic, chemistry and other fields of industry. For example, many of them you can find on http://mstnano.com/

Starting Math Major soon, how to approach? RedRobin9688 18/07/14(Sat)11:25 No. 16675 ID: 241c58 [Reply]

File 153156031540.jpg - (132.79KB , 757x502 , 1510097214290.jpg )

I move in 8/5/18 and intend to Major in Mathematics, there are four options (Pure, Applied, Applied Stats, Actuarial) which should I formally choose to actually succeed? Should I double major? and if so what in? I'd appreciate the help, I don't want to move in with the parents after school.

2 posts omitted. Click Reply to view.
Anonymous 18/09/28(Fri)21:03 No. 16697 ID: 4f487e

Acturials are the end boss of accountants.

Anonymous 18/10/22(Mon)09:24 No. 16711 ID: 848b2c

Actuarial are accountants for companies, rather than for individuals. They deal with statistics, mostly, to determine what might happen with a given set of starting variables. Most visibly, actuarial tables are what these people produce for life insurance companies, so they can guess at what age you're likely to die (based on sex, height/weight, blood tests, diet, lifestyle, and increasingly: genes) and adjust your rate accordingly so that they are most likely to profit.

Anonymous 19/03/02(Sat)06:44 No. 16754 ID: 13825c

Applied if you want to work on real world problems.
Pure if you want to work on problems we couldn't possible test or might not happen in reality.
Applied Stats if you hate life and are boring.
Actuarial if you don't mind having no soul for a lot of money.

What Would Happen if You Didn’t Sleep? Anonymous 19/02/17(Sun)13:43 No. 16748 ID: 099d2a [Reply]

File 155040740742.jpg - (73.13KB , 1024x683 , lack-of-sleep-1.jpg )

Sleeping is not just nice but it is healthy as well. Lack of sleep can cause some serious health issues, like depression, memory loss, increased blood pressure and risk of stroke, so make sure that you get at least 8 hours of sleep each night. Here is what happens to the body if you do not sleep.

Artificial sweeteners Anonymous 16/02/21(Sun)10:07 No. 16288 ID: f705da [Reply]

File 14560456503.png - (28.70KB , 787x653 , s.png )

Supposing a given artificial sweetener -- say, saccharine or aspartame -- was a carcinogen, what kind of cancer would it produce and by what mechanism?
If this question is too hypothetical to answer, by what mechanism would ingesting a non-toxic chemical cause cancer?

13 posts omitted. Click Reply to view.
Anonymous 18/12/28(Fri)17:15 No. 16736 ID: be6f8f

>Food can not cause cancer
Well, artificial sweeteners are not food. They have no nutritional value.
On the other hand, heavy alcohol consumption can cause cirrhosis of the liver, which increases the risk of liver cancer.

>Cancer is caused only by bacteria and viruses.
What about things like ionizing radiation, or exposure to contaminants such as tobacco smoke, asbestos, etc.?
What about hereditary cancers?

Anonymous 19/01/27(Sun)19:04 No. 16743 ID: c00a95

Ionizing radiation does not cause cancer, but radiolysis, it is the accelerated decomposition of tissues, and not their degeneration in a structural form. Radiation can cause mutations in embryos, but it is not cancer.
Carcinogens and toxins are capable of causing cellular automaton breakdown, but for this, the body’s immunity must already be undermined by the introduction of viruses and bacteria, or by exposure to parasites.

Anonymous 19/01/28(Mon)20:05 No. 16744 ID: be6f8f

Radiolysis is the breakage of chemical bonds caused by exposure to high-energy particles. For example, such a breakage could happen inside an ADN molecule, causing its later copy to have an error. In other words, a mutation. Such a mutation can be cancerous.
Quoting Wikipedia:
>Exposure to ionizing radiation is known to increase the future incidence of cancer, particularly leukemia. The mechanism by which this occurs is well understood, but quantitative models predicting the level of risk remain controversial. The most widely accepted model posits that the incidence of cancers due to ionizing radiation increases linearly with effective radiation dose at a rate of 5.5% per sievert.[3] If the linear model is correct, then natural background radiation is the most hazardous source of radiation to general public health, followed by medical imaging as a close second.

When someone says "X causes cancer" or "X is a carcinogen", they're not saying "if you do X once you'll get cancer the following week". What they're saying is "X can increase the rate of mutations in your DNA, and a higher rate of mutations is a higher risk of cancer over time".

>Carcinogens and toxins are capable of causing cellular automaton breakdown, but for this, the body’s immunity must already be undermined by the introduction of viruses and bacteria, or by exposure to parasites.
That's not true. The immune system is capable of killing some mutated cells, but not necessarily every possible mutation. A typical infection can last what, a few weeks at most? Cancer lasts for months or years. If not having cancer was just a matter of having your immune system up to snuff, practically no one would ever get cancer.

Also, what a silly argument. If I see you wearing a helmet and then take it off, and while your head is uncovered I smack with a club, would you say that the cause of your headache is that you took your helmet off, and not that I hit you with a club?

What Different Blood Types Mean? Anonymous 19/01/23(Wed)22:32 No. 16741 ID: 175ba2 [Reply]

File 154827913693.jpg - (296.22KB , 900x633 , transfusion-history-1.jpg )

The first experiments with human blood donation happened in the early 19th century. Did they even know what blood types were back then? Wait, what are they?
You can read more here: https://bit.ly/2DtOqs7

Experimental Gravitational Physics Anonymous 19/01/14(Mon)01:57 No. 16738 ID: b72b93 [Reply]

File 154742745126.jpg - (24.39KB , 700x368 , ligo_background-large-white.jpg )

Any postgrads here who do this stuff?
I've always been more of a mathy guy but now I'm considering joining the group at my uni. They do stuff with LIGO mostly.
Just wondering if there is promise in this field. Cause I'm hesitant about continuing with theoretical physics.

Homosexuality, could it be an anomaly in brain developement? Dr. Nick Riviera 15/02/05(Thu)04:59 No. 16039 ID: 8ec688 [Reply]

File 14231087868.png - (64.35KB , 320x307 , Dr__Riviera.png )

Hi guys, to begin I just want to make a couple of things clear.

- This thread is NOT about discrimination of homosexuals.
- This thread is NOT about considering homosexuality as disease.
- This thread is for pure scientific discussion.

Well, let me begin by telling you that I'm a med student and a embriology assistant at my university and I'm not a native english speaker, so you may encounter some grammatical errors in the text, but you'll get the point.
This whole dilemma began two weeks ago, when my brother told my family that he is gay. It was quite a shock, not because of the fact of him being gay but because he doesn't fit the gay man stereotype. He's a big dude, loves sports, bearded, the true definition of what some call "manly man". We accepted him, of course, and I have to say I've never seen him happier.
But after a few days I began to think, was he always gay? Did he decided to be gay? Why now? These questions started lingering in my mind. So I went to talk with my him about it.
He told me that he always has been, for as long as he remembers. Nothing has changed about him, except for his sexuality (for us, not for him haha). So that got me even MORE questions. Why are some gay men that are like extremely feminine? Why are some gay women extremely masculine? Why are gay guys like my brother who don't appear to be gay? Why do some gay people feel like they are traped inside the other genders body and need to get medical treatment (sex change surgery, hormone therapy) and why others don't?And why are there women like that too? Why many species, whose main goal is to survive (actually this is every species main goal, it's literally in our DNA), has certain individuals who are the contrary to this?
So I decided to tackle all these matters from a scientific point of view? What if during the development of the lymbic system (the part of the brain which controles emotions, memory, sexual desire, etc.) something doesn't go as it should?
So after I thought of this I told myself I couldn't be the first one to ask myself these questions. And of course I wasn't in a world with 7 billion people so thanks to the magical power of the internet I managed to get a cool text about the subject. I took some paragraphs which I thought were the most interesting, still I'm leaving the link (please don't take the text as discriminatory, it's merely scientific, it refers to homosexuality as an anomaly in brain developement because seen from a medical point of view it is, still doesn't mean it's moraly wrong).

"..the body and the brain first become sexually differentiated at about the third fetal month. Prior to this age, although genetically male or female, the fetus is physically/sexually-neutral. With the formation of the testes, and the secretion of testicular androgen, target ti Message too long. Click here to view the full text.

29 posts and 1 image omitted. Click Reply to view.
Anonymous 18/06/28(Thu)13:24 No. 16669 ID: c6e9b2

Who cares? Homophobes causes much more problems than the opposite.

Anonymous 18/11/12(Mon)09:57 No. 16720 ID: 0dfe17

wow faggots

Anonymous 18/12/27(Thu)15:45 No. 16734 ID: d4b8d9

There probably are many homosexuals whose preference could be attributed to divergent fetal development, but given how subjectively humans are able to perceive reality, it's just as likely many homosexuals are simply more interested in their own sex.

In the end, whether you consider it to be brain damage or the whims of the heart doesn't matter; we have not yet developed the technology to ensure the masculization process completes nor have we developed the science to fully account for the subjective differences in people's worldviews. The former we may achieve at some point, but the latter is inherently impossible.

Someday (rather soon), we're going to have Gattica-style designer babies, but we will never "cure" homosexuality.

Genetic Philanthropy - Genetophil Anonymous 18/09/29(Sat)17:53 No. 16698 ID: ed3f35 [Reply]

File 153823642149.jpg - (76.75KB , 1280x720 , genes.jpg )

Why not create a charity to raise IQs in third world nations? Some leading experts say genetics account for 80% of IQ by the time you're 18. The average IQ is dropping worldwide. Would it be ethical to increase IQ through genetic engineering?

4 posts and 1 image omitted. Click Reply to view.
Anonymous 18/10/08(Mon)20:26 No. 16704 ID: be6f8f

I think you have cause and effect inverted. It's not that rich people want poor people so they can apply certain economic policies, it's that certain economic policies applied by rich people cause other people to be poorer. Basically, a society where some participants believe they should get wealthier without end inevitably leads to economic inequality.

Anonymous 18/10/22(Mon)09:20 No. 16710 ID: 848b2c

IQ is largely irrelevant to economic productivity and almost COMPLETELY irrelevant to social power; just look who we have in the White House if you're tempted to disagree (or who we MIGHT HAVE HAD, if you still do). Take a black child out of poverty and stick them in a wealthy Western household with a proper education and a diet composed of more than literal garbage, and they will grow up to be a productive adult.

That said, an IQ test measures little more than your proficiency at taking IQ tests. It was NEVER a measure of intelligence; it was a measure of educational achievement as a tool to focus on struggling schoolchildren with poor learning ability, and at best has a tenuous connection with adult intelligence except in extreme cases (like profound retardation: <20IQ). Studies have shown that people with higher IQs don't achieve more as adults but for statistically insignificant amounts.

So you could do this, sure, but nothing would change. The only thing that will is waiting for most of them to die, and then raising the living conditions up to a Western standard for the survivors. Doing it BEFORE letting them die is more humane, sure, but will probably collapse the global economy by the end of the century, likely leading to widespread war and the end of civilization. There's just too fucking many of them.

Anonymous 18/11/10(Sat)12:56 No. 16719 ID: c6e9b2

I cant' totally agree. Yes, most westerners wouldn't just breeze trough the life in the average african village. Stirling paints in Islands in The Sea of Time a vivid picture of the back-breaking work needed to grow your own crops.

Their intelligence may help them work more organized, but the raw strength is what matters. - As in all agrarian societies.

But in modern societies general intelligence (g) is more important than raw strength. And there's no link between general intelligence and industriousness (i).

I score high on g, but really low on i (just ask the tax authorities). And you can never disregard the society someone lives in.

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