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, U.S., September 12, 2019. REUTERS/Brian Snyder 

1990 Nobel Laureate in Physics Jerome Friedman (R) plays the role of "Visting Scholar" during the mini-opera "Creatures of Habit" at the 29th First Annual Ig Nobel Prize ceremony at Harvard University in Cambridge, Massachusetts, U.S., September 12, 2019. REUTERS/Brian Snyder 

Audience members throw paper airplanes at the stage during the 29th First Annual Ig Nobel Prize Ceremony at Harvard University in Cambridge, Massachusetts, U.S., September 12, 2019. REUTERS/Brian Snyder 

Silvano Gallus of Italy accepts the Ig Nobel Prize in Medicine for the study "Does Pizza Protect Against Cancer?" at the 29th First Annual Ig Nobel Prize Ceremony at Harvard University in Cambridge, Massachusetts, U.S., September 12, 2019. REUTERS/Brian Snyder 

Patricia Yang accepts the 2019 Ig Nobel Prize in Physics for the study "How Do Wombats Make Cubed Poo?" at the 29th First Annual Ig Nobel Prize Ceremony at Harvard University in Cambridge, Massachusetts, U.S., September 12, 2019. REUTERS/Brian Snyder 

1990 Nobel Laureate in Physics Jerome Friedman raises a toast at the 29th First Annual Ig Nobel Prize Ceremony at Harvard University in Cambridge, Massachusetts, U.S., September 12, 2019. 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" at the 29th First Annual Ig Nobel Prize ceremony at Harvard University in Cambridge, Massachusetts, U.S., September 12, 2019. 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" at the 29th First Annual Ig Nobel Prize ceremony at Harvard University in Cambridge, Massachusetts, U.S., September 12, 2019. REUTERS/Brian Snyder 

Timothy Voss of the Netherlands holds the 2019 Ig Nobel Prize in Economics at the 29th First Annual Ig Nobel Prize Ceremony at Harvard University in Cambridge, Massachusetts, U.S., September 12, 2019. 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" at the 29th First Annual Ig Nobel Prize ceremony at Harvard University in Cambridge, Massachusetts, U.S., September 12, 2019. REUTERS/Brian Snyder 

Master of Ceremonies Marc Abrahams, editor of the "Annals of Improbable Research," holds up the 2019 Ig Nobel Award at the 29th First Annual Ig Nobel Prize Ceremony at Harvard University in Cambridge, Massachusetts, U.S., September 12, 2019. REUTERS/Brian Snyder 

Audience members throw paper airplanes at the stage during the 29th First Annual Ig Nobel Prize Ceremony at Harvard University in Cambridge, Massachusetts, U.S., September 12, 2019. REUTERS/Brian Snyder 

Andreas Voss (L) and Timothy Voss of the Netherlands accept the 2019 Ig Nobel Prize in Economics at the 29th First Annual Ig Nobel Prize Ceremony at Harvard University in Cambridge, Massachusetts, U.S., September 12, 2019. REUTERS/Brian Snyder