Neil deGrasse Tyson. FYI: After WWI ended, 100 years ago today, a scattered epidemic of the Spanish Flu became a pandemic, as millions of soldiers shipped home, spreading the disease internationally, killing an additional 50-million people worldwide. Think we live in violent times? During World War I, on average more than 10,000 people died per day for every day of the war — a football stadium’s worth of people every week.