Round 61, Height of the tallest
standing building on Earth in 1800
The 159.7 m tall Lincoln Cathedral (England) was built in 1300, but it collapsed in 1539. Two other cathedrals were also over 150 m, both were destroyed (by lightning strike). So the title was inherited by Strasbourg Cathedral with it's
142 m height.
151 - Zak130 - Chulk
169 - Usrin
110 - Duplode
104 - Bonzai Joe
513 - Akoss Poo (LOL)
2, Usain Bolt's personal best in 400 m:
45.28, I hope once he'll try it again (his 300 m performance was more than promising: 30.97, the second best result behind Michael Johnson's 30.85)
44.66 - Usrin45.96 - Akoss Poo
44.52 - Bonzai Joe
44.50 - Chulk
46.50 - Zak
39.12 - Duplode

3, Current file size of "estimationgame.xls" on my computer: one worksheet, only
21504 bytes29183 - Bonzai Joe36400 - Zak
42976 - Usrin
86572 - Akoss Poo
92000 - Duplode
155648 - Chulk
4, Number of days when Otto von Bismarck (died: 30th July 1898) and Nils Bohr (born: 7th October 1885) were both alive:
4679 days4444 - Zak3900 - Duplode
5896 - Usrin
1212 - Bonzai Joe
701 - Akoss Poo
9000 - Chulk
5, Distance between Hockenheims's and Sepang's finish line:
10008 km (according to Google Earth)
8849 - Usrin11344 - Bonzai Joe
8200 - Zak
12000 - Chulk
12321 - Akoss Poo
13750 - Duplode
6, Performance of the original Lada Niva SUV (in horse power), believe me or not, only
72 HP (and still better than a Hummer:
http://www.youtube.com/watch?v=ct7ScV3NmFM 
)
65 - Zak60 - Usrin
43 - Duplode
120 - Chulk
135 - Bonzai Joe
350 - Akoss Poo
7, Lens diameter of Grande Lunette optical refractor in Nice (built in 1886):
77 cm75 - Akoss Poo101 - Usrin
52 - Chulk
180 - Duplode
240 - Bonzai Joe
800 - Zak
8, El Clásico: the first yellow card will be shown in the ?? minute (hopefully Pepe or Sergio Ramos will get it

)
40th minute, Pedro, quite a surprise (everybody expected earlier cards)
33 - Chulk26 - Duplode
19 - Akoss Poo
17 - Zak
12 - Bonzai Joe
10 - Usrin
9, Fleet size of Cargolux Airlines (how many airplanes?) -
14 (all of them are Boeing 747-400 or 747-8F)
11 - Zak35 - Duplode
38 - Usrin
50 - Chulk
92 - Bonzai Joe
540 - Akoss Poo (it would be so great...)
10, Difference of the highest and lowest temperature values recorded in our flat since 2009
Min. 10.0°C (at least 30 minutes long refreshing aerate in the coldest winter, it came back to 20°C in two hours), max. 35.8°C (no air-conditioner

), so
25.8°C22.1 - Usrin21 - Duplode
19 - Zak
16.1 - Bonzai Joe
15 - Chulk
13.8 - Akoss Poo
11, Number of design patents hold by Thomas Edison
Tricky question. Edison was quite successful patentee, he had 1093 in overall: 1084 of them were utility patents and only
9 design patents. Sorry!
21 - Bonzai Joe96 - Akoss Poo
256 - Zak
570 - Duplode
897 - Usrin
1200 - Chulk
12, Saturated vapor pressure of ethanol at 25°C is
7.8 kPa12 - Chulk1.5 - Akoss Poo
16.9 - Usrin
22 - Duplode
38 - Bonzai Joe
200 - Zak (another nice paralel universe, getting drunk by breathing

)
13, The lowest price of an Apple Inc. stock in 2011:
310.5 USD400 - Chulk420 - Zak
94 - Akoss Poo
14.99 - Usrin
8.37 - Usrin
2305 - Bonzai Joe
+1, Number of ZakStunts replays sent by South American pipsqueaks in 2011: 7 pipsqueaks,
213 replays214 - Usrin (almost there...)
162 - Bonzai Joe
150 - Chulk
144 - Duplode
121 - Zak
430 - Akoss Poo
Results of round 64 - Usrin & Zak
3 - Chulk
2 - Bonzai Joe
1 - Akoss Poo
0 - Duplode
Overall standings23 - Chulk
15 - Akoss Poo
14 - Duplode
14 - Zak McKracken
9 - Bonzai Joe
8 - Usrin
2 - Super Brian