October 24, 2014 6:42 pm NYC Disease Doctor Answers Questions on Ebola Dr. Abdulrahman El-Sayed, a professor of epidemiology at Columbia University’s Mailman School of Public Health, answers NBC 4 New York viewer questions on how Ebola is spread. Local 3:01 I-Team: NYPD officers testify in surveillance video controversy 1:59 2 suspects charged with murder in Long Island body parts case 2:35 Extra NYPD patrols in Central Park after series of violent crimes 3:01 Columbia begins suspending students after protesters defy deadline 0:32 Luxury ‘Hamptons Streamliner' bus service to debut in May for travel from Hudson Yards