Jiwon Han, a student at the University of Virginia walks backwards while carrying a cup of coffee during...
Jiwon Han, a student at the University of Virginia, demonstrates what happens when a person walks backwards while carrying a cup of coffee after being awarded the Ig Noble Fluid Dynamics Prize for "A study on the Coffee Spilling Phenomena in Low Impulse Regime," during the 27th First Annual Ig Nobel Prize Ceremony at Harvard University in Cambridge, Massachusetts, U.S. September 14, 2017. REUTERS/Gretchen Ertl