manglav

"The idea was simple enough.. what if there was..." Typo. Might want to fix it ASAP!

I don't quite follow your reasoning of why the law is wrong. You say yourself "Te is assumed constant", yet you imagine that converting the Te from a constant to a variable could affect the result. However, if you change Te from a constant to a variable, Newton's Law of Cooling is null and void, because a simplification is that Te is constant, and that allows a lot of /dt's to cancel.

The law is correct for when you can assume a constant Te, for example an object within a fluid flow (like an airplane wing during flight). The problem is, for stagnant situations, convection plays a huge role in heat transfer within the air. Controlling convection is really really hard, and even harder in a scientific setting that needs to be reproducible. Also, when dealing with transition temperatures, various things need to be taken care of, such as supercooling. This can literally stop working if your beaker is slightly dirty. So the problem is there isn't a way to universally control the conditions for this experiment. However, I did find that the winner of the RSC paper had a suitable explanation that involves the presence of supercooling for the colder sample of water. Essentially, if the colder sample supercools, it will take slightly more time to freeze, because while it should have frozen, the ice does not have a nucleation site. On the other hand, the warmer sample does not supercool, and freezes upon reaching 0 C. This experiment only works if the temperature difference is slight, probably within 15-30 C. Quite ingenious really!

Edit: After reading the rest of the comments, air bubble/filtered water/de-ionized water all have great effects on ice nucleation and supercooling, which for me supports the winner's paper.

I would convert from a B2C to a B2B company. Focus on partnering with existing medical school on a subscription basis to supplement their textbook. Easily charge $10 / student / year. While in the end, the same student is being helped, the rate of adoption skyrockets due to a "me-too!" affect. All medical schools are in a race, and if one school has a tool, the others just have to have it. All you need are two or three schools to get started, and you can give a discount for it initially.

In the meanwhile, I am also working on a project myself, and could use an experienced team to help build the prototype. Let's discuss both projects! Email in profile.

edit: This is essentially SRS for anatomy? Cool, good idea. Nice detailed pictures as well.

I just did, and didn't see anything I violated. I could be wrong though, and would love to correct my behavior. I said it was absolutely crazy because if you go frame-by-frame there is literally a flash of white in a single frame, then the explosion. No build-up, no nothing. It happened within 3/24 of a second. If you make some estimate of the scale, you could use dimensional analysis to estimate the energy of the explosion. The time scales are a little large, but it could be done to probably two orders of magnitude.

This is absolutely crazy. I will tell my professor, and hopefully we can do a case study on how to prevent explosions like these.

Yes I checked them myself. I clicked each course, and saw if all the notes, quizzes, and exams with solutions were there. Around 30% were missing. So I do not define that as amazing. Anything from coursera, MIT Opencourseware is usually good. Also, there are many resource compilations posted to HN that can be searched via hnsearch.com

I'm not sure why you had to ask me if I am sure, when you could have easily corroborated or discredited my statement by checking yourself. And if you did, why didn't you post your own conclusion?

more than 75% are incomplete, so while a good resource, not amazing. Nice find though, and the practice quizzes and exams with solutions may help people.

Hack propaganda piece? He has almost 30 years experience in the public school sector. Isn't that relevant and valuable? You use the words client instead of student, which is actually the first time I've seen that in writing.

" the clients are all free to shop for the services of another provider". I don't even know how to respond to this one. What percentage of people can afford private school? Did you even read this? He resigned due to the increasing amount of government regulations and his lack of control over his own classroom. How many "private practice" teachers even exist? 10%? 5%?

"recognize that plenty of people like the current system just fine". That wasn't the point of this article by far. It was one teacher's experience, not an editorial on how everyone hates the system. But if you bring up the point, please cite your sources. Show me what government employed teachers like the current system just fine.

I really can't believe you referred to a student as a client. It just feels to me completely against the spirit of education.

This only works when people are separate enough so they have an individual silhouette. If doing length of line tracking however, it becomes much more tedious, with edge detection necessary and such. Also, if using a 360 camera, this becomes more complex, as a person in the middle blob shape would be completely different from a person at the edge. I am aware you can use a filter, but it cuts out some area sometimes.

This is a surprisingly hard problem that I've explored before. Feel free to email me about it!

This is the best summary of the overall case that I could find. http://abovethelaw.com/2013/02/judge-threatens-alleged-copyr...

do you have a blog of some sort? I am going to pursue this lifestyle as well, and any tips are extremely valuable. Hooray for traveling!

I've always wanted to do this, and actually have talked to some GI's making this happen. They always said you can do it for a couple of months, but the stomach is designed to handle solid food. I definitely plan to become a beta tester for him though. For a college student, this is a dream.

Unfortunately, metal implants in the body still cause long-term problems and inflammation in the surrounding area. Otherwise, they could have used laser sintering to make a adamantium skull.

I've never understood why people dance around naming names when calling companies out. Doesn't that help the whole community? Now I know Tim is a good guy, and specific people tried to waste the author's time. If I ever publish a book with O'Reilly, I know to avoid those people. "The issue is with the entire company", which is made up of people. When people get good service, they use names. When they don't get good service, they suddenly avoid names at all? I just don't get it.

In my experience, they rarely mess up with that. I usually use SO, Google, and quora (very good for "is this better than that?" or compare and contrast different db's").

That said, try posting examples if you want more feedback?

you can also download it through their website as well, except their site is being hit super hard right now (error 500).

paywall / registering wall.

It was slightly tongue-in-cheek, but I would say that company R&D has a higher chance of getting to market than government R&D. And yes, they may have gotten gov't grants, but it's still managed by a respected engineering company.

but it's not government funded, so I don't think it applies. Funny how xkcd applies to so many things though haha.

Did they really just promise fusion power within four years? I don't know why I'm seeing this on HN...it should be trumpeting and blasting through our media like wildfire. I mean, this is an article's dream - no details, extravagant claims (which I hope are true), and a high profile company. I can't wait for this to be on the NYT.

Is this a big deal? With my limited understanding of networking stuff, couldn't you just set up a CNAME or something? Without showing the user the full url? I agree it's a slight inconvenience, but it's not a huge letdown.

Hi RailsReady. I highly advise you to move off launchrock and use a a custom site for signups. What does it say to me about your technical skill if a simple sign up website is out of reach? You can even continue to use Launchrock, but use the embedded widget in a custom site. Also, there are several rails tutorials about a easy sign-up page for a startup, one is here http://railsapps.github.com/tutorial-rails-prelaunch-signup.....

Yeah, I was surprised when a torrent wasn't available. This also seems like a perfect use case for http://burnbit.com/.

same for me on Chrome Version 23.0.1271.95 on Windows 7.

Two things - 1. This is a hard problem to respond to. 2. From what I've seen, most people on HN respond better when they see the OP has made some effort. Sort of like a homework problem. Your post mentioned very little about what you've done to get out of your situation, so that may have been why they were not enthusiastic to respond. I sincerely believe with your set of skills, you should be able to support yourself easily and anonymously if needed, or even emigrate. Great programmers are needed everywhere. Try looking for a company started by an Iranian, and apply there! There's always a way. Good luck!

I've seen bitcoin on HN at least a couple of times in the past month, so maybe just read a bit more thoroughly. Your sources seem fine, but I would add Arstechnica to it.

I wasn't aware of all the difficulties, I'm very sorry. This might be the perfect use case for bitcoins however...at least until you can emigrate.

Odesk you can't, Elance did not say anything about it. And that is not stopping him from freelancing himself. There's plenty of opportunities in the Hiring Freelancer thread as well.

I'm not familiar with these issues however, so I'll refrain from posting more haphazard advice. I just feel the OP could make some more effort.

Do you know of any resources to start this? I am essentially going to do a pilgrimage around the world, starting from SF. Going to Mexico, Panama, South America, Africa, Europe, Asia, with a hop to Australia. It would be great to talk to some people who manage something like this, and how they manage their freelancing.

This is so great! I'm planning a world programming trip, and this is so helpful for that. Do many people freelance on the go like this? Considering a programmer could at least earn $30/hr, at 20hrs/wk thats $2400 / month. Clearly enough to spend a month in each country, even with some fun.