Results of round 141, Area of Fort Knox army post in USA, Kentucky (square kms)
Answer:
441 km2, quite bad tips from all of you
35 - Duplode25 - Bonzai Joe
7 - Usrin
5.1 - Akoss Poo
5 - Zak McKracken
7777 - Friker
2, Length of my MSc thesis written in 2006 (words)
Even I was surprised to see, how short it was... Only
10,723 words (83,478 characters), everybody overestimated my spamming skills.
16,202 - Akoss Poo18,700 - Zak McKracken
19,842 - Duplode
29,999 - Usrin
38,100 - Bonzai Joe
77,777 - Friker
3, From Earth, Sirius seems to be

times brighter than Vega (apparent magnitude)
According to wikipedia: Sirius -1.46m, Vega 0.03m; so the result is 100^(1.49x0.2)=
3.945, all of you were quite close
4 - Zak McKracken, whooops

3.7673 - Akoss Poo
4.365 - Usrin
3.2 - Bonzai Joe
2.7 - Friker
2.3 - Duplode
4, Number of ZSC races where Akoss Poo and Bonzai Joe both finished in worse positions than the fastest Dutch pipsqueak?
Answer:
3 (ZCT 12, 14, 15; all of them won by Roy Wiegerinck) - was it too easy?
3 - Akoss Poo, Duplode and Bonzai Joe (enjoy your 1-1-1 pt for that instead of crying

)
4 - Usrin
7 - Friker
12 - Zak McKracken
5, The current market value of Mario Balotelli (in Euros)
A hysterical monkey for
24,000,000 Euros?!? Naaah...
22,000,000 - Akoss Poo20,000,000 - Usrin
32,000,000 - Bonzai Joe
37,000,000 - Duplode
7,777,777 - Friker
5,000,000 - Zak McKracken
6, Average daily water consumption in our flat since 29th December 2010
Answer:
145.3 l115 - Duplode193 - Akoss Poo
80 - Zak McKracken
77 - Friker
16 - Bonzai Joe (are you insulting me?

)
333 - Usrin
7, If you draw an Eiffel Tower - Kreml - Etna triangle in Google Earth, how much will be the smallest angle in that polygon?
Answer:
37.4 degrees (Moscow)
45 - Zak McKracken46 - Usrin
47 - Bonzai Joe
27 - Duplode
19.5 - Akoss Poo
17 - Friker
8, Number of known sculptures made by Pablo Picasso.
Everybody underestimated the genius: he made
1228 sculptures! Btw have you ever noticed his full name, Pablo Diego José Francisco de Paula Juan Nepomuceno María de los Remedios Cipriano de la Santísima Trinidad Ruiz y Picasso?

Picasso was exceptionally prolific throughout his long lifetime. The total number of artworks he produced has been estimated at 50,000, comprising 1,885 paintings; 1,228 sculptures; 2,880 ceramics, roughly 12,000 drawings, many thousands of prints, and numerous tapestries and rugs.
37 - Duplode33 - Zak McKracken
27 - Friker
7 - Akoss Poo and Usrin
5 - Bonzai Joe
9, Population of Spa (Belgium) in 2012
Answer:
10,579 inhabitants10,005 - Akoss Poo12,932 - Duplode
4,444 - Usrin
1,235 - Bonzai Joe
77,777 - Friker
90,000 - Zak McKracken
10, How many windows does the next 10-story block of flats have?
11 levels, 24 flats per level, 4 or 5 windows per flat (average: 4.5) and still some other windows (corridor, staircase, basement)... If I calculate well, the result is
1358. We can argue about what you mean on "window" (the separate window sashes or the whole one including those), but even with the second definition, the result is higher than your tips (830).
501 - Usrin277 - Friker
240 - Duplode
160 - Bonzai Joe
150 - Zak McKracken
138 - Akoss Poo
11, When was Shimano Inc. founded? (year, month)
Answer:
February 19211920 - Zak McKracken, who else?

July 1917 - Friker
March 1897 - Duplode
January 1950 - Usrin
March 1954 - Bonzai Joe
April 1974 - Akoss Poo
12, Empty weight of a TGV Duplex train (tons)
Answer:
380 tons501 - Usrin, winning twice with 501 - are you a bourgeois Levi Strauss fan?

550 - Zak McKracken / 210 - Bonzai Joe
85 - Duplode
27 - Friker
36000 - Akoss Poo

(that's the weight of a thick 2.5 x 4 x 186.5 m golden rod - just to demonstrate with a "train-like" body...

)
13, Number of countries without an airport
Only the
5 European mini-countries have no airport: Andorra, Liechtenstein, Monaco, San Marino and Vatican.
6 - Bonzai Joe7 - Usrin
11 - Zak McKracken
13 - Akoss Poo, Duplode
17 - Friker
+1 How many days passed between Mingva's and Dark Chaser's USC victory?
Mingva (Jósvafö) 17th December 2003, Dark Chaser (Porto) 30th October 2005; so the correct answer is
683 days597 - Akoss Poo845 - Bonzai Joe
420 - Usrin
1012 - Duplode
177 - Friker
87 - Zak McKracken
Results of round 145 - Akoss Poo
4 - Duplode
3 - Zak McKracken
2 - Bonzai Joe and Usrin
0 - Friker
Overall standings42 - Chulk
33 - Zak McKracken
32 - Duplode
28 - Akoss Poo
26 - Usrin
22 - Bonzai Joe
11 - CTG
6 - Friker
4 - Alan Rotoi
3 - Argammon
2 - SuperBrian