When you are selecting an area you can hold option when dragging to move the top and left sides of the rectangle. This is useful to select exactly the right area.
One better, I can link you to it (I had written my own version at work, but ran across this and forked it to switch out the command names, since someone else had done it alreay)
There is also Zipcar Flex in London. You can park the cars in on-street parking, even paid or residents bays. But they have only agreed it with some councils so far. Map: https://www.zipcar.co.uk/takethebluepin#zipzone-map
It doesn't say that all land is discovered. It only shows data about oceans; it's called "Unknown Oceans" and shows data from the Census of Marine Life.
why does allocating "pi^2 for a gold, pi for a silver and 1 for a bronze" mean "there could never be any tie in the total scores except when two countries had exactly the same medal counts in all three categories"?
I'm sure someone will pipe up with a more exact answer (likely using permutation and/or combination in their specific mathematical senses), but I believe it's because summing medals is algebraic, and with the given weights there's no way for the sum of any combination of non-identical medals that equals any other. The values of 𝛑 and 𝛑² (and the patient, unacknowledged workhorse 1) provide this. Looking at a simple case where s is the number of silvers and b the number of bronzes, there's no value of b that can equal any value of s·𝛑. You could use another triple of weights, such as (𝛑, e, 1) as well.
Medals are awarded in integer quantities, and you don't want j·g+k·s+l·b=0 to be possible for integer j,k,l (except when all three medal counts are 0).
This is actually a slightly stronger condition than is needed, because no country can earn negative medals and there are a finite number of medals available, so you could actually have the weights for eg. gold and silver medals differ by a rational factor as long as the denominator was large enough.
But does it handle "Google Chrome" and "Google+" correctly? Clearly, these should be written as "Alphabet Inc's Google's Chrome"† and "Alphabet Inc's Google's Google+", respectively.
There was a great talk on the topic of CRISPR-Cas9 at the Hacker News London meet up this month by Edward Perello. Video is here: https://vimeo.com/137001197. It's a good introduction to the topic from a hacker's perspective.
What's to stop an unscrupulous developer selling an app for, say, $1.99 with the (implied) promise that the app will work forever and then, once people have bought it, turning off the backend so it no longer works?
Is this illegal? Would Apple shut down the developer's account?
I think it would depend on the jurisdiction, and the "degree" of "implied promise". Eg. in Norway there's pretty strong protection for (private) buyers. On the other hand, proving fraud in the case of the company behind the app simply declaring bankruptcy/shutting down would probably be pretty difficult.
I suppose a relevant study would be Microsoft Zune/music store, and/or Yahoo(?) Music that shut down and killed the DRM servers, effectively removing music people had "bought"?
I'm not sure why Zune keeps coming up as an example in these threads. It got rebranded to Xbox Music, but all the servers are still up and anyone who subscribed still has all their music.
An earlier Microsoft DRM that was used by a bunch of services (PlaysForSure) was indeed shut down, but it's not the same thing as Zune.
