* separar palavras-chave com vírgula
Melhores sites Science 1-15:
1.
academia.edu 
492,401

2.
nature.com 
436,775

3.
cbc.ca 
413,160

4.
Wired.com 
384,433

5.
nationalgeographic.com 
341,340

6.
masrawy.com 
308,161

7.
sciencemag.org 
302,578

8.
tamilwin.com 
274,344

9.
usgs.gov 
265,356

10.
ucf.edu 
225,470

11.
space.com 
216,433

12.
uwaterloo.ca 
213,270

13.
tufts.edu 
194,012

14.
popsci.com 
162,178

15.
totaljobs.com 
138,367

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