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Google
Rank	Domain	PR	Backlinks	Pages in URL
1	www-istp.gsfc.nasa.gov	6	14700	2400
2	wiki.answers.com	7	1960000	11800000
4	answers.yahoo.com	8	26200000	127000000
6	everything2.com	7	204000	2400000
8	en.wikibooks.org	7	318000	135000
9	en.wikipedia.org	8	61800000	3750000
11	boston.com	8	3830000	1330000
13	nationmaster.com	7	247000	6100000
15	thefiringline.com	5	63600	574000
16	aviation-history.suite101.com	4	1530	39

Yahoo
Rank	Domain	PR	Backlinks	Pages in URL
1	en.wikipedia.org	8	61800000	3750000
2	everything2.com	7	204000	2400000
3	aviation-history.suite101.com	4	1530	39
4	inventors.about.com	7	82400	14000
5	wiki.answers.com	7	1960000	11800000
6	science.howstuffworks.com	5	331000	28700
7	ffden-2.phys.uaf.edu	4	2920	2870
8	nasa.gov	9	4910000	35900000
9	northstar.k12.ak.us	4	6620	12300
11	howstuffworks.com	5	3060000	2140000

Bing
Rank	Domain	PR	Backlinks	Pages in URL
1	en.wikipedia.org	8	61800000	3750000
2	ffden-2.phys.uaf.edu	4	2920	2870
3	historylearningsite.co.uk	5	29900	2110
4	science.howstuffworks.com	5	331000	28700
5	blackstonedaily.com
6	madsci.org	4	31600	34700
7	www-istp.gsfc.nasa.gov	6	14700	2400
9	en.wikibooks.org	7	318000	135000
10	library.thinkquest.org	7	279000	255000
11	dictionary.reference.com	8	2270000	5910000

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