* separar palavras-chave com vírgula
Melhores sites Science 1-15:
1.
academia.edu 
498,002

2.
gizmodo.com 
440,696

3.
nature.com 
436,775

4.
cbc.ca 
387,374

5.
Wired.com 
365,523

6.
nationalgeographic.com 
350,043

7.
masrawy.com 
310,523

8.
sciencemag.org 
302,578

9.
tamilwin.com 
280,422

10.
sciencedaily.com 
259,491

11.
usgs.gov 
255,521

12.
space.com 
239,858

13.
ucf.edu 
225,470

14.
uwaterloo.ca 
213,270

15.
tufts.edu 
194,012

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