Stripper tips and Coca-Cola spermicide highlight wacky Ig Nobel awards at Harvard

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ECONOMICS PRIZE
Geoffrey Miller, Joshua Tybur and Brent Jordan of the University of New Mexico for discovering that a professional lap dancer's ovulatory cycle affects her tip earnings.

PHYSICS PRIZE
Dorian Raymer of the Ocean Observatories Initiative at Scripps Institution of Oceanography, USA, and Douglas Smith of the University of California, San Diego, USA, for proving mathematically that heaps of string or hair or almost anything else will inevitably tangle themselves up in knots.

CHEMISTRY PRIZE
To Sharee A. Umpierre of the University of Puerto Rico, Joseph A. Hill of The Fertility Centers of New England (USA), Deborah J. Anderson of Boston University School of Medicine and Harvard Medical School (USA), for discovering that Coca-Cola is an effective spermicide, and to Chuang-Ye Hong of Taipei Medical University (Taiwan), C.C. Shieh, P. Wu, and B.N. Chiang (all of Taiwan) for discovering that it is not.

LITERATURE PRIZE
David Sims of Cass Business School. London, UK, for his lovingly written study "You Bastard: A Narrative Exploration of the Experience of Indignation within Organizations."