Matthew Feldman, a University of Florida student who is conducting research this summer at Rice University, broke a Guinness World Record for joggling -- jogging and juggling -- tonight at the Rice University running track. Feldman jogged one mile while simultaneously juggling five balls in 6 minutes, 33.65 seconds; he beat the previous record of 7 minutes, 41 seconds held for 23 years by American Bill Gillen.