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/sci/ Science & Math

Threads added between 2013/05/08 and 2013/05/15

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Most viewed threads in this category

6 more posts in this thread. [Missing image file: F5.png]
Wondering if someone can help me out and solve this. If not, cool. Someone asked me to do it, and Im far too lazy/dumb to figure it out at the moment. Questionnaires were mailed to 5,000 people who were selected randomly. Each person was asked to list age, sex, smoking habits, and respiratory symptoms during the preceding seven days. About 80% of the questionnaires were completed and returned, making the final completed sample of 4,000. There were 1,100 total smokers in the sample. There were 1,000 respondents who had respiratory symptoms. About 700 of the respondents reported having upper respiratory symptoms and also smoked. There were 2,600 respondents who neither smoked nor had any respiratory symptoms. But there were 400 who smoked but had no respiratory symptoms. Calculate the odds ratio of the disease and exposure.

Missing chunk!

44 more posts in this thread. [Missing image file: at-earth21.jpg]
What would realistically happen to the planet if there was a relativistic event outside the atmosphere (a spherical micro blackhole), between the Earth and the Moon, big enough to erase a piece of each in a clean cut but not large enough to eradicate all live (immediately), leaving them with a literally with "a bitten apple" effect? I'm trying to write a story / setting with this setup, but even in books I just can't find any info of what would be the realistic consequences of this explosion. Pic sorta related.
15 more posts in this thread. [Missing image file: 1367039636806.jpg]
After you die, it is believed that you have 7 minutes of brain activity left inside you, and in the 7 minutes you experience your entire life over, in a kind of dream… because in a dream time feels stretched. so if this is the case, what if right now you’re in that 7 minutes. how do you know if you’re alive or just reliving old memories?
13 more posts in this thread. [Missing image file: lel.png]

question for mathfags

18 more posts in this thread. [Missing image file: 1341257358669.gif]
What are the most efficient methods of solving for x? For quadratic equations we can immediately write down the answer. But as soon as the equation is non-linear and involves different kinds of functions applied to x the method of solving for x is not obvious anymore. Most often we cannot even see if it can be solved for x at all. What is the fastest method of determining whether an equation can be solved? And in case it can be solved, what is the fastest method of finding x?
1 more posts in this thread. [Missing image file: IMG_0346.jpg]
Does anyone have any tips for isolating strains of bacteria and doing reduction streaks? I've tried many reduction streaks but the colonies are either too small to be removed with a loop or too large and they are no longer pure. Most of the time, though, the fourth streak doesn't even contain any bacteria. Pic related it's my shitty reduction streak with E-Coli and B. Cer.
14 more posts in this thread. [Missing image file: loweritall.gif]
>med school applications Thought I would give this a try. Who's applying? Where? Let's support each other.
18 more posts in this thread. [Missing image file: differentiation.jpg]
Will there ever be a period in humanity where it's casual nomenclature to tell the time to a fellow public transportation passenger the time in planks?
20 more posts in this thread. [Missing image file: image.jpg]
What would happen if you stepped on a treadmill that was going at, or approaching, the speed of light?

Fuel Economy

13 more posts in this thread. [Missing image file: Fuel Economy.png]
Hey sci, Can we discuss the history of fuel economy in cars and trucks? Refer to the pic. In response to the oil crisis in the early 1970s, Congress passed some standards that called for doubling the passenger-vehicle efficiency within 10 years in 1975. This can be seen in the figure with car fuel economies going from about 13 to around 26 mpg. But then from about 1985 to 2005, fuel economy remained constant. I'm finding it hard to believe that for 20 years, no progress was made on technology that could make cars more energy efficient. I'm wondering why you think this is the case. Here's a couple of my ideas. Please discuss them and also present your own. 1) Fuel prices remained relatively low so there was not much pressure to increase fuel economy. 2) Energy companies subsidize research of the auto industry. As such, if some company comes out with a 50 mpg car, for example, they cease to fund this company, making it harder for this company to compete. This may seem like a 'conspiracy,' but really it's just pure economics. Why would an energy company spend money to see more efficient vehicles? This would result in them selling less fuel. 3) Car companies intentionally keep fuel economies low for sake of ensuring their long term success. Ex: Say an alternate fuel vehicle hits the market with lower fuel prices. Car companies can then compete by improving their fuel economies, effectively making their fuel prices lower and out competing the new technologies/new fuels. Do you think any of these theories hold water? Source for pic: http://www.pewenvironment.org/uploadedFiles/PEG/Publications/Fact_Sheet/History%20of%20Fuel%20Economy%20Clean%20Energy%20Factsheet.pdf
6 more posts in this thread. [Missing image file: Daniel-faraday.jpg]
Would it be a correct analogy to say that statistics is the shadow of probability?
5 more posts in this thread. [Missing image file: 1328363588174.jpg]
Why is everything in the universe spinning/orbiting? Where does the energy to spin comes from? Will it run out?
3 more posts in this thread. [Missing image file: 1366608973773.jpg]
>implying winter
20 more posts in this thread. [Missing image file: 644577_566978646667283_2054824117_n.jpg]
Something I've been wondering /sci/ In quantum mechanics you only ever hear about the act of measuring some property, but is it possible to do a partial observation? For example, instead of "measuring it's position" can you check to see if the particle is in a certain region? Obviously if it is there then the outcome is the same, but what happens to the state of the particle of it is found to NOT be in that region? I would imagine that all other probabilities would increase the more you rule out certain possibilities. Or is it just not possible? Although I can't imagine why it wouldn't be.
6 more posts in this thread. [Missing image file: 1341475131952[1].jpg]
How many ways are there to distribute 15 objects among five distinct assembly lines when the first two lines must get at least two objects, the third and the fifth line should get a non-zero but even number of objects and the fourth line gets any number of objects?

Education system and validation

50 more posts in this thread. [Missing image file: Philosoraptor.jpg]
(1 of 2) Here are some of my thoughts on the education system and how it rewards certain types of students. Please tell me what you think. Tl;dr: I dont think it is good for test scores and grades to be rewarded because it makes recipients validate themselves. And, those who dont get the high test scores and grades feel ashamed and inferior. The students who don't recieve high grades/test scores are no less important than the students who do. The high scoring student is just as human (and potentially just as useful to society) as a low scoring student. **** I think it is important to ask ourselves why we reward these high test scores. Is it to motivate other students to do better? This would imply that success in the world is directly determined by how well you do in school. They may be related, but I do not believe that- beyond doubt - it can be proven that high scores and high grades cause success in society. One can make an important contribution to society without having high test scores. Often, the opposite is what happens. In order to rationalize their apparent inferiority, students will begin to tell themselves that school, and more importantly inquiry and knowledge, are not important.
2 more posts in this thread. [Missing image file: 106px-Secobarbital.svg.png]
why seconal is secobarbital sodium or quinalbarbitone sodium. i mean, the molecule is the secobarbital and the sodium part is that when you drink it you are drinking it in salt form, how this works?

Home lab?

13 more posts in this thread. [Missing image file: snapshot.jpg]
Where can I go to get cheap lab supplies? I've been looking on ebay so far. Also, if you have a home lab please post some pics and tell us about any projects you've been working on. The pic is my measly lab. Hopefully it will be better this summer

Creatures like Weeping Angels

47 more posts in this thread. [Missing image file: weeping angel.jpg]
Out there in the galaxy if not the universe. Is it possible that evolution can conceive a creature similar to or like the weeping angels from the British sci-fi show Doctor Who? I honestly do not see how it is possible for an alien lifeform to suddenly become stone whenever it is aware that one is looking at them.
9 more posts in this thread. [Missing image file: 289763.jpg]
If i slept: Monday - 8 hrs Tuesday - 7 hrs Wednesday - 7 hrs. Thursday - 7 hrs. 30 mins Friday - 7 hrs. 30 mins Saturday - 7 hrs. Sunday - 7 hrs. whats the average amount I've slept in one week?

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