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/sci/ Science & Math

Threads added between 2015/05/27 and 2015/06/03

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Most viewed threads in this category

Why not sleep nude?

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>less than 1 in 10 Americans sleep naked >74% pajamas Why? Just what is wrong with all those people? What is the purpose of wearing clothes to bed? Obviously this can only be a disservice to quality of sleep.
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Can somebody who's recieved a M.Sc or Ph.d in Physics be qualified to develop weapons like these?
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>literally nobody passes the exam I guess nobody was worthy this year
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I postulate that "Autism" is the next stage in human evolution. Those who are "Autistic" have many traits superior to neuro-typicals and the rate of people born who are classified as "Autistic" is increasingly at an accelerating rate.
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>just found out that john Nash died >To depressed to get out of bed So how are you guys doing today?
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Atoms are hollow. And as we know nature is repetitive. Why can't planets be hollow with a central sun (nucleus).

New Horizons - Pluto

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One month, just one more month. Such thrill, I never felt this before.
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I just spent the last 6 hours working on muh first path integral >that feel when you finally get it congratulate me, /sci/
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So /sci/ my organic chemistry is a little rusty (non-existent) is there a possible reaction pathway to convert phenylalanine into amphetamine?
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What's your opnion on this kind of research? http://www.sciencedirect.com/science/article/pii/S1048984311001287 Basically they take the characteristic x and says it's correlated to y where y is a good thing. For me it's fucking stupid and just coincidence but maybe I'm wrong.
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Are CS majors as bad as eng*neers?
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what's the most interesting thing you know? eg double slit experiment, shit blows my mind

ask me anything

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I'm a high school chem teach I also do AP and remedial. I will answer these to my 10th grade class today

Les Classes Préparatoires aux Grandes Écoles

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http://en.wikipedia.org/wiki/Classe_préparatoire_aux_grandes_écoles Is there anything comparable to the classes prépas in the US? I read up on some private businesses that help kids prepare the SAT and the like, but I do not know of any American school that admits students based solely on an actual contest. The other thing about the taupes is that they are basically free, being part of the public education system, and it is technically possible - although extremely rare - for a kid from the impoverished banlieues to get into the best Lycées in France provided he gets good enough grades at the Baccalauréat, and thus have access to, say, the ENS and potentially Fields Medal-tier research, completely free of charge. He might even get a grant from the state depending on his revenue and capital. IMHO, this is the closest to a meritocratic system there is (or at least that I know of), being that the classes prépas are absolutely exhausting and the contests literally impossible to finish, but the selection is such that only the best get to ultimately enter the schools. Tell me why I'm wrong, /sci/. http://www.sujetsetcorriges.fr/dl/X/Maths/MP/sec-x-2002-maths1-MP.pdf
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hey /sci/ what is your opinion on sleeping? how can we be more produtive during the whole day and sleep less ?

HPV vaccine causes severe reactions

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http://www.independent.co.uk/life-style/health-and-families/thousands-of-teenage-girls-enduring-debilitating-illnesses-after-routine-school-cancer-vaccination-10286876.html >Since September 2014, girls have received only two injections; the second is taken six to 24 months after the first. >The NHS says the programme has proved to be “very effective”. >However, other countries are taking action following reports of increasing numbers of girls suffering side effects. > A Danish TV documentary broadcast earlier this year highlighted the large number of girls who appear to have been affected following their HPV vaccination. Some, like those the Ryalls have met in the UK, are now wheelchair-bound. Last year, >Japan withdrew its recommendation for the HPV vaccine because of reported side effects. Oh shit is this true? They admit I did think the HPV was being pushed through with a little bit of questionable motivation but I figured it would be beneficial. Apparently it's not worth it.

Travelling Salesman Problem

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'sup /sci/? I have created a formulation of the travelling salesman problem which takes into account the time at departure/arrival and allows the salesman to leave a node at any time after they have arrived. The formulation is both linear and combinatorial. Has this been done before? My literature review says no, but there might be something I missed. I have come across three formulations which are similar by Fox, Gavish and Graves (1980) (these guys produce two of them) and (Vajda (1961)) but these both constrain the salesman to leave at the stage immediately after they arrived.
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Hello /sci/, Can you give me an intuitive explanation for this ?
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ITT: we giggle at people who refuse to accept that the halting problem is uncomputable. Videos like this: https://www.youtube.com/watch?v=92WHN-pAFCs that provide very elegant and visual explanations of the halting problem are downvoted and packed with people insisting that the argument is false. Terminology: >H(machine, input) = if machine(input) halts then return true, otherwise return false >X(n) = if H(n, n) then loop forever, otherwise terminate The core of the proof is that X(X) has no well-defined behaviour, showing that H is contradictory by nature. Favorite arguments for why this is supposedly bullshit includes: >H isn't making the mistake, the dumbass person negating its output is making the mistake. Just don't do that and you'll be fine. >X doesn't count because it was deliberately set up to make H fail. Why are you so mean to H? H didn't do anything wrong!! >The argument starts with an assumption (H exists) and my philosophy teacher said you can't do that. >Who are you to decide what's "correct" output anyway? >The problem isn't the machine, it's the problem that's impossible to solve. (this one's correct but missing the point) >I'm a software engineer and I've worked for Google for 15 years so shut up. Why is this so difficult for people to get? People with legit trouble understanding are welcome to ask questions and willl be met with polite explanations. People who insists that their misunderstandings are correct will be laughed in the face.

Is the universe infinite?

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There was a really interesting video in which some mathematician talked about how if the universe was infinite, objects would have no mass. Can anyone find the video and explain what's the reasoning behind this claim? Maybe because during the big bang a limited amount of energy would have to propel forward an unlimited amount of mass?

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