Barbara Allen Hill bites her hair during the mini-opera "Creatures of Habit" at the 29th First Annual Ig Nobel Prize ceremony at Harvard University in Cambridge, Massachusetts, September 12, 2019. Bizarre scientific discoveries were celebrated at the annual Ig Nobel Prizes, awarded by the Annals of Improbable Research as a whimsical counterpart to the Nobel Prizes.

REUTERS/Brian Snyder 

1990 Nobel Laureate in Physics Jerome Friedman (R) plays the role of "Visiting Scholar" during the mini-opera "Creatures of Habit". REUTERS/Brian Snyder 

Audience members throw paper airplanes at the stage. REUTERS/Brian Snyder 

Silvano Gallus of Italy accepts the Ig Nobel Prize in Medicine for the study "Does Pizza Protect Against Cancer?". REUTERS/Brian Snyder 

Patricia Yang accepts the 2019 Ig Nobel Prize in Physics for the study "How Do Wombats Make Cubed Poo?". REUTERS/Brian Snyder 

1990 Nobel Laureate in Physics Jerome Friedman raises a toast. REUTERS/Brian Snyder 

Shiguru Watanabe of Japan is interrupted by Miss Sweetie Poo Emily Yue-Lin Chen (R) as he accepts the Ig Nobel Prize in Chemistry for the study "Estimation of the Total Saliva Produced Per Day in Five-Year-Old Children". REUTERS/Brian Snyder 

Fritz Strack of Germany accepts the 2019 Ig Nobel Prize in Psychology for the study "Inhibiting and facilitating conditions of the human smile: a nonintrusive tester the facial feedback hypothesis". REUTERS/Brian Snyder 

Timothy Voss of the Netherlands holds the 2019 Ig Nobel Prize in Economics for a study on testing which country's paper money is best at transmitting dangerous bacteria. REUTERS/Brian Snyder 

Shiguru Watanabe of Japan accepts the Ig Nobel Prize in Chemistry from 1993 Nobel Laureate Richard Roberts (R) for the study "Estimation of the Total Saliva Produced Per Day in Five-Year-Old Children". REUTERS/Brian Snyder 

Master of Ceremonies Marc Abrahams, editor of the "Annals of Improbable Research," holds up the 2019 Ig Nobel Award. REUTERS/Brian Snyder 

Audience members throw paper airplanes at the stage. REUTERS/Brian Snyder 

Andreas Voss (L) and Timothy Voss of the Netherlands accept the 2019 Ig Nobel Prize in Economics for their study on which country's paper money is best at transmitting dangerous bacteria. REUTERS/Brian Snyder