In a gas the molecules are moving around with lots of space between them without much interaction. Some quickly, some slowly, all in different directions. Occasionally they collide and bounce off each other, or more rarely they may temporarily form weak (liquid) bonds with each other until a fast molecule hits them and breaks them apart.
In a liquid the molecules (which are indistinguishable from gas molecules of course if you looked at them individually) are moving much slower and form and re-form weak (liquid) bonds with the molecules near them. But still there are some moving faster and others more slowly and they are going in random directions.
Now think about the surface where the liquid meets the gas. There are some gas molecules that plunge into the liquid and become part of the liquid and there are some liquid molecules moving fast enough to escape from the liquid, breaking all their weak (liquid) bonds, and become part of the gas. The liquid surface at a molecular scale will not be a nice flat surface. It will be a complex seething bubbling thing with droplets and molecules leaving and rejoining the liquid. If we heat the liquid, make the molecules move faster, more of them will be moving fast enough to escape from the liquid. Anyway, if there are more molecules going from the gas to the liquid we say the gas is condensing, and if there are more going the other way the liquid is evaporating. Now think what would happen if we take away all the gas molecules - put the liquid into a vacuum. There will no molecules returning to the liquid, only liquid molecules becoming gas. Conversely, if we compressed the gas above the liquid we would get more gas molecules going into the liquid.
Get a syringe. Fill it about a quarter way with water. Turn it facing up and squirt out any air bubbles. Block the end where the needle goes with your finger. Pull the plunger back hard as if you're filling it all the way up. You'll pull a hard vacuum and you'll see the water inside bubble as it boils at room temp.
You're looking for the Ideal Gas Law (http://en.wikipedia.org/wiki/Ideal_gas_law), which is derived from Boyle's Law (relation between gas pressure and volume), and Charles's Law (expansion of gas when heated).
The related concept here is that liquids remain liquid when the vapor pressure of the substance is less than the atmospheric pressure.
So, by the above laws, you can make water boil by (a) heating the water to increase the vapor pressure, or (b) reducing the atmospheric pressure to less than the existing vapor pressure of the water, or (c) some combination of (a) and (b).
The code is open-source and there is even an Wordpress plugin.
BTW: I always wanted a website or newspaper that covered stories that made the headlines to investigate it years later, to see how these people are doing now or how events shaped their lives. Would be interesting to read.
Scott Adams (Dilbert) wrote a blog post about how to match people who would like to travel together, instead of packages, a couple of years ago. But the problems, namely trust, are essentially the same.
His idea to connect people with GPS is something you could use. His screening idea's are something you could also incorporate.
To make this an succes I would create a social networking site so that everyone who wants to participate can be publicly hold accountable. If all my personal data is known to you I would think twice before I'd steal a package. A scoring system would bring up the most reliable people to do business with.
Steve Pavlina wrote a post about his one week on, one week off workflow. It's similar to the post that's discussed here. It doesn't really matter how long your on and off days are.
He uses his on days to get as much done as is possible and his off days to just do what he wants. In the off days he gets the inspiration and motivation for another round of high productive on days.
I also noticed similar effects in my own life. It's like creating little deadlines for yourself where you have to get something done within a couple of days, and you make everything work to do just that. Within the 9-to-5, monday through friday mentallity it always seems if there will be another day to get it done. There's no pressure.
Also, the long days off indeed help to think creativly about your work and have idea's and solutions just 'pop up' at random.
