1. science
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    1,410
    Updated:
    May 19, 2009
  2. science
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    361
    Updated:
    May 19, 2009
  3. science
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    450
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    Mar 7, 2009
  4. science
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    322
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    Feb 26, 2009
  5. science
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    1,238
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    Feb 25, 2009
  6. science
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    512
    Updated:
    Feb 18, 2009
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    580
    Updated:
    Feb 17, 2009
  8. science
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    403
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    Feb 17, 2009
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    387
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    Feb 17, 2009
  10. science
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    554
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    Feb 17, 2009
  11. science
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    555
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    Feb 17, 2009
  12. science
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    509
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    Feb 17, 2009
  13. science
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    815
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    Feb 17, 2009
  14. science
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    295
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    Feb 8, 2009
  15. science
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    483
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    Feb 8, 2009
  16. science
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    543
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    Feb 5, 2009
  17. science
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    1,240
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    Feb 1, 2009
  18. science
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    797
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    Jan 29, 2009
  19. science
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    381
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    Jan 29, 2009
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    335
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    Jan 29, 2009
  21. science
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    390
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    Jan 27, 2009
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    492
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    Jan 27, 2009
  23. science
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    345
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    Jan 25, 2009
  24. science
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    918
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    Jan 22, 2009
  25. science
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    458
    Updated:
    Jan 21, 2009