Bubbles and UROPs

Bubbles and UROPs OK, so were going to follow up on this white water rapids question. Some interesting theories have been tossed around, and Id like to discuss them, because I have nothing better to do with my life. First off, super biology queen Mollie says, Im sure at least some of the foam is due to proteins and oils sloughed off the skin of the people on the slides when you shake up a water/protein solution (for example, by sending water + people goo down a water slide at high speed), you get bubbles. This is similar to Shannons comment, which suggested that the chlorine in the water might have something to do with it. Now, I know Mollies onto something, because thats definitely true. But you can witness this white water phenomenon all the time- when no ones used the slide for 15 hours, in pool water, in salt water, in fresh water, in the ocean, where Im sure that a bunch of people going to the beach isnt enough to supply the whole damn ocean with enough sloughed proteins to make every single wave crest white. Plus, there arent any sloughed skin cells in my drinking water (I hope) when I turn the faucet on high to fill a glass, but the white foam appears anyway. Id be willing to bet that th e type of water and the things in it (salt, chlorine, oils) play some kind of role in how pronounced the foam is or how long it sticks around, but that cant be the whole story. Of course, Dan is completely right when he says that air bubbles get into the water, causing the foam. But why is it white? Thats my question here. Shannons going in the right direction when she starts talking about optics: Wait, how about this since water generally reflects color (blue on sunny days, grey on cloudy ones), and the bubbles are thin layers of water on almost every side, maybe its just the overload of colors that its exposed to on all those sides. White is all the colors combined, right? I just remember it as the opposite of paint. Now I think weve got it. Only, Im not sure it has anything to do with what the water is actually surrounded by. A single bubble is iridescent, right? You can see streaks of all different colors in it, because of the way light refracts when it passes through the thin film of water. Remember- a green streak absorbs all of the light except green- thats whats being reflected back to your eye. If something is white, that means all of the light is reflected. So I imagine that when you have a bunch of really small bubbles next to each other, all of those colors combine to give white light reflected back. Maybe. It still seems like a stretch to me, but its the best Ive got. Responses to Comments: Anna asked: Are there any IKEA stores (the Swedish furniture store chain) anywhere in the Boston/ Cambridge area? Hopefully (crosses fingers)Ill get into MIT, and if I do, I need a place to buy inexpensive yet quality home stuff; or are most dorms already furnished? (Sorry for the weird question). OK, there is totally an IKEAsomewherenearby. I know this because my awesome floor planned an IFAF (or almost planned an IFAF?) to visit the nearby IKEA with another floor. Justfor fun. Or something. Anyway, so I know there is one somewhere, but Im not sure where. So I asked Sam, who said, There is an IKEA somewhere in Boston. It just recently opened. I dont know where, exactly, but its on the green line. So it wont take you more than 30 45 minutes to drive there. Its important to note that your dorm will come with a bed, desk, chair, and closest/dresser, but like Anthony says, sometimes some extra light is nice. Anna asked: Many colleges let students pay for part of their tuition through on-campus jobs. Does MIT have any interesting jobs of this nature (such as laboratory work, research, or other science-related jobs, etc). Have you or anyone else you know had some sort of experience with this? If so, how does one go about applying to these? This ties in nicely with what SUchi asked: Question: How ample are research oppurtunities for those whose major is not scientific? Like, what if I were to major in eco.? If youve been keeping up with the financial aid information that youve been sent (which can be really hard, so now worries), youll know that MIT requires each student to contribute a certain amount to their own education each year. (Check out the Making MIT Affordable pamphlet for more information.) This number was $5,500 per year, but then something happened where MIT decided to match Federal Pell Grants, which for many lucky students (like me! =) lowered their total self-help. At least, I think thats how it happened. In any case, the point is that youll be responsible for some amount (less than or equal to $5,500 per year) towards your own tutition. You should have already sent in a form detailing how much of that you plan to earn and how much you plan to borrow. (But dont worry, those numbers are completely flexible, so you can always change them if your financial/employment situation changes.) There are plenty of jobs to be had on campus. You can be a dorm desk worker, an admissions office worker, a library assistant, and a million other things. Of course, if thats not cool enough for you (but really, who doesnt want to work for this guy?), you can always be a lab rat. I mean scientist. =) UROPs are plentiful- just check out Meliss blog for a whole bunch of cool projects people have worked on. In my experience, everyone who has wanted a UROP has found one, one way or the other. Of course, some projects and labs are much more popular than others, so you may not to get exactly the position you want, but you should be able to find something. At MIT, theres research into everything. If youre specifically talking about econ, check out their research page and browse. Its good advice for any topic that youre interested in- after checking the employment listings and the UROP webpage, just surf around the MIT site. From the main page for each department you can usually find a research page pretty easily. Dont be shy about just emailing professors and asking them about their work- thats how Mollie got her job.