After crowd sourcing nominations and four rounds of voting, we have the inaugural October Madness Champions! Thanks to everyone who participated by voting in Sigma Xi's Nobel Prize prediction brackets for the 2015 prizes in physiology or medicine, chemistry, and physics.
Physiology or Medicine
Your prediction for the Nobel Prize in Physiology or Medicine is Craig Venter, Francis Collins, and Eric Lander for the human genome sequence.

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Craig Venter |
Francis Collins |
Eric Lander |
How you voted in the final round:
Craig Venter, Francis Collins and Eric Lander for the human genome sequence
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57.1%
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David J. Julius for investigations on the molecular basis for pain and thermosensation
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42.9%
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Chemistry
Your prediction for the Nobel Prize in Chemistry is Harry Gray, Stephen Lippard, and Richard Holm for work in bioinorganic chemistry.

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Harry Gray |
Stephen Lippard |
Richard Holm |
How you voted in the final round:
Harry Gray, Stephen Lippard, Richard Holm for work in bioinorganic chemistry
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53.8%
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Michael Grätzel for solar cells
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46.2%
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Physics
Your prediction for the Nobel Prize in Physics is Vera Rubin and Kent Ford for dark matter.

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Vera Rubin |
Kent Ford |
How you voted in the final round:
Vera Rubin and Kent Ford for dark matter
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66.7%
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Geoffrey Marcy, Michel Mayor, and Didier Queloz for discovery of extrasolar planets
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33.3%
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Who Will Officially Win?
Watch for the official Nobel Prize announcements from NobelPrize.org. According to their website, the announcements will be made at these dates and times (times are listed as local time in Sweden):
Physiology or Medicine: Monday, October 5, 11:30 a.m. at the earliest
Physics: Tuesday, October 6, 11:45 a.m. at the earliest
Chemistry: Wednesday, October 7, 11:45 a.m. at the earliest
October Madness Isn't Over
Anyone who nominated a researcher who goes on to win a Nobel Prize this year will be entered into our raffle for prizes. Stay tuned! We plan to announce winners on October 13. Plus, we will be back next year with the 2016 round of October Madness!
Looking Back on Voting
Sweet 16 Voting Results
Elite 8 Voting Results
Final 4 Voting Results
Other Predictions
We aren't the only one making predictions. See other's ideas in this article from Nature.
Heather Thorstensen is the manager of communications for Sigma Xi, The Scientific Research Society.