cat9

As far as dates go, did they use Certified Mail or a similar service? Does the postmark agree with their date or yours? Writing a date on the letter doesn't prove anything about when they sent it.

If it's a scam an not incompetence, a letter from a lawyer will probably shut them up quickly. Litigation usually isn't acquired, you're switching their opponent from a consumer they think they can scam to a professional they know they can't.

Having links on the site fail arbitrarily devalues the entire page. Users aren't stopping and thinking "hey, is clicking this link going to waste my time?" - which results in the entire system being perceived as less reliable and trustworthy.

I agree that such discussions are off-topic, but is there a better way to handle these articles than "RTFM, noob"?

It sucks to have to change your stance after the fact. There will probably be vocal opposition to doing so. But your odds of still being in business three years from now just shot up.

Figuring out which people and when is, generically, a matter of doing your homework with customer development and targeted marketing, and then further improving your marketing surface as you learn more about who is a customer and how to find them.

Going from "this might be useful" to a working business model is, of course, a deeply nontrivial problem...but it's one that many people have solved before, and it's a heck of a lot easier if you don't start with "maybe $25 per year."

Your rates should not be pinned to a lowball bid for an annual salary for a newly minted CS student. You're assuming far more risk, and hang around just long enough to deliver major value and get out, rather than being just productive enough that it's not worthwhile to hire someone to replace you.

You need to operate like a business that is delivering a high-value service in exchange for a reasonable fee. And you should probably narrow down your offering & marketing to the point that you have very few direct competitors, and practically none once you account for location and availability.

If you can constructively and reliably ship code to prod, you almost certainly have better immediate options than Elance.

Worst case, calling ten different web agencies in your area will probably get you enough work to pay the bills, likely at rates which are not unreasonable, and with far less pathological clients than you'd find on Elance. You might have to call another ten after that, if your luck is bad or if your sales skills are poor.

After that, what? Full-time job? Freelancing? Another startup? Get out of software and into the exciting world of fruit vending?

It's a wide world and you have skills that are in high demand. What do you want the next chapter in your life to be about?

If transaction time is important, hard drives are high bandwidth. Ten 1TB hard drives are $500. Two 6TB hard drives are also $500, but you have fewer drives to worry about shipping. Five 2TB hard drives are about $370, if drive price is more important. Using ten 1TB drives is only best if we're optimizing for load / unload time and have that degree of parallelism in the pipeline. Otherwise, one of the other two will be better, depending on price sensitivity vs. other factors.

If it's not as time-sensitive, something like BitTorrent Sync will get the job done. This doesn't require shipments, additional hardware, or mucking about with hardware at either end, so it's very nice if "get it there ASAP" isn't a constraint.

Regardless, don't ship the only copy.

This breaks down the second you encounter, for example: Fourier transforms, wave equations, or hyperbolic geometry. Physicists are trying to understand the world, which in many cases does not comport itself in a way which is considerate of our naive intuition about mechanics and geometry.

The nth dimensional component of a vector still has a specific meaning within the context of the parent model, but it's far easier if you stop trying to force that and learn to deal with vectors as vectors instead. This allows for abstractions which are portable between the very many places where vectors are useful, instead of trying to force each value to fit an ad hoc cognitive model, with whatever flaws and conceptual limits that it introduces.