Please mod parent up! (Had mod points to burn just a couple days ago.)
How confusing the inputs of a system is to the computer is something that the program should be easily able to figure out, except in cases where the human drivers are hosed as well.
Umm, no. Read some actual historians who have done the research. The reason there is this popular myth of early marriage has to do with selection bias -- most marriages in medieval times that we have records for were aristocratic marriages, and their goal was less about love or even children than about cementing alliances, so they could happen at ridiculously young ages. Common people often didn't bother to get married at an actual ceremony (and certainly not recorded) until after the Reformation. Anyhow, a number of historians HAVE found records and accounts to look at marriage age in NON-aristocratic marriage (which was the majority of marriage), and they have found the GP's account to be roughly true -- median age for women marrying was early 20s... until just the past couple centuries. I believe the youngest median marriage age for women was somewhere in the late 19th or early 20th century. Look it up.
We should take your data here and apply it to the topic on hand, then. The cultural norms of the time required Muhammad to have many such aristocratic marriages, for the purpose of cementing alliances. In the context of the time, across nearly the entire globe, Muhammad's behavior was not unusual for a man in his position.
There will be transaction fees. Because of what jeremyp said. Also, it is only a minscule slice of the people on this planet who can dare touch more than pocket change worth of bitcoin, without the benefits of some kind of insurance. Exchanges will step in and be part of that solution, eventually, once they are stable and respected enough to be backed by real money. So that "large amounts of money anywhere in the world for free" is never going to happen, in any important sense.
Bitcoin and similar have a shot at competing with credit cards. The real question is how much lower the fees be than 3%, once all kinds of overhead are factored in. Thinking in terms of zero costs is just a fantasy. Luckily for the bitcoin aficionados, the bar for success if not nearly so high. They do not have to achieve zero fees in order to be a big success.
There is a degree of guesswork I was making. It could be spiders, or it could be that these shifts look like movement, which might be a bird.
I was just watching a mockingbird in my yard the other day. They hunt for bugs by standing still on ground under bushes, then opening their wings. The underside of their wings has a strong white & dark pattern. Apparently that can trigger an insect flight instinct of some kind, causing the insects to move, revealing their location to the sharp eyes of a very still bird's head.
So this black & white trick is not unique to zebras. Even a hunter can use it against the insects. That suggests the instinct must be quite valuable to the insects themselves.
My guess: Flying towards a striped surface, when you are dependent on multi-faceted bug eyes, looks like flashes of light. Flying insects have evolved instincts to avoid flashes of light, because that is your only tell tale sign that you are about to get caught in a spider web.
So it is not that they have an "aversion" to striped surfaces exactly. But when approaching a striped surface they will tend to suddenly turn 90 degrees away, which comes out to the same effect.
Yes, it was in the interest of the German people to not play the war game, from a rational point of view. We understand that. However, in Hitler's estimate, his own personal interests and the interests of the German people were served best by other means.
Both Hitler and Stalin often acted as if they feared their generals more than their outside enemies. This underlying motivation precipitated decisions that were against the interests of the people of their respective nations, and creates thousands of "if I were in charge" scenarios. But the fear that Hitler (or Stalin) himself might be put out to pasture (or under perhaps under the pasture) unless he produced a string of military successes is not actually crazy at all. The assassinations attempts did almost get Hitler before the Red Army came near.
Arithmetic is being able to count up to twenty without taking off your shoes. -- Mickey Mouse