It is certainly profitable for a type 1 civilization to move to a type 2 civilization as long as energy consumption and population continue to naturally grow as has happened so far here. Same thing for type 2 to 3. Also, I think that decisions about space travel are not purely for economic reasons and probably in almost any advanced species there is a large amount of the population willing to pay something to explore.
I think that smaller (portable) versions are currently almost impossible to make. Square-cube law is a big factor here, and there would be a ton of inaccuracy. Maybe if it was done very well. Coil guns are more feasible and can probably be much more efficient, so more powerful, at smaller scales.
I wanted to use the longest time period possible, and this was the most info I could find about forecasted cloud coverage in NYC in the past 10 years or so. It's also worth noting that this is just an example, the paper it's based off of is more in-depth. Unfortunately they concluded that transaction costs made trading based off of this strategy almost not worth it, but the main point here is that it's interesting.
The only practical way of making something like this work would be to collect all the photos taken ~2 hours before the bombs went off near the finish line. You could do this by searching Facebook, Twitter, and Instagram for geotags and keywords/hashtags then sorting by date and time. Dump all the photos into a database and do your best to sort by time (duplicates shouldn't be much of a problem). I don't think there would be too many photos, probably less than 5,000. Then see if you can find what the bombs looked like before they went off, then go back and find when they first placed.
If anyone is interested in doing something like this, I can help, so let me know.
I don't really like the idea of putting a lot of photos of traumatized people on internet, photoshit happens, the last thing that those sons, women, family could merit is to be lynched on internet.
If you know or suspect that the bags were black, a reasonable solution that maybe could have success without to blow up all the remains of privacy could be:
1-to create a filter that makes a copy of the originals AND change all colors of the bunch of photos in a named directory to i.e. soft blue... EXCEPT a small range of black tones.
2- Thus, you could check or search then in the bunch with another script what photos have those suspicious black tones. And you could choose to move those photos to a different dir for a preliminary analysis, maybe saving a lot of time.
2- or you could search for photos taken from same place in different times (very frequent in a competition) that have black tones NOT changing of place in a specific time. People moves, claps, node, etc, bags with bombs don't.
3-You could refine the script to permit to enter any desired tone also and mask all the other colors. The goal is to find quickly a bag, but keep the privacy of innocent people and victims that do not deserve this.
I thing that should not be much challenging technically.
To be exposed on internet again and again, or to put pictures of happy friends and members of the family that now are in an hospital will add a lot of unnecessary suffering and probably will enlarge the "satisfaction" of the authors, the "success" of the operation, and I'm writing this with a very angry face.
We have to avoid this.
If you have a photo of the marathon, any photo, not only of the finish line, send this photo to the police.
To care and show respect and love for the victims, dead and alive, should be a priority, in the same level as to put the authors in jail. (only my opinion).
As a student, I agree, but it's not this simple. My parents still expect me to get a job, and I need something to do other than just sit in my room all day on my computer. It's nice to have people to talk to, and I don't have any friends who are entrepreneurial and hackers who can be a good cofounder or whatever. It doesn't seem like there are any great solutions to these problems, but maybe I'm not looking/thinking hard enough.
What, exactly, is "happening"? I'm all for bitcoin, and I think it would be kind of a cool form of currency. Bitcoin is more elegant than standard currency, but many of the interactions that happen with standard currency are not possible with bitcoin.
Right now, the value of bitcoin is in the increase of price in bitcoin. I assume that's what you mean by "happening". That doesn't mean anything. Store owners, starting with online store owners, have to at least start accepting the currency, which they have shown no signs of doing. So again what, exactly, is "happening"?
Bitcoin is still a baby. I think many people who say stuff like this are missing the point and not seeing long term. This is like saying the internet will never be useful because it's just text and 14.4 kbps is the fastest modem.