Berlin is in Europe, so quoting the area as 10,000 m^2 (as in the original article) would have been nice. Are most HN readers really from the US?
I ran a poll here a couple of months ago [0]. While far from being accurate, it could at least be considered somehow representative for the HN audience (it lasted more than 24h on the front page, so all time zones were covered). Even though the non-US group seems to have caught up compared to a couple of years back, the US still dominates the HN audience.
[0] https://news.ycombinator.com/item?id=3298905
Edit: typo
http://www.mattmazur.com/2009/03/a-brief-hackernews-traffic-...
Ten and a bit square feet to the square metre. Know it, use it, love it.