Which four-winged predatory insect belongs to the order Odonata?

Four students were killed and nine others wounded by National Guardsmen at which Ohio university on May 4, 1970? Four teammates, a house, a hog line and a tee line are all part of which sport? Which four-time New York governor used "The Sidewalks of New York" as his 1928 presidential campaign song? Four treaties to lessen the horrors of war were signed in which Swiss city in August 1949? Which U.S. commonwealth hosted the 2001 Miss Universe pageant, won that year by its own Denise Quiñones? Which four-word phrase describes an overbearing, strutting man? In 40 BC Cleopatra gave birth to twins fathered by which Roman? About 4,000 years ago, the first needles used in which Chinese medical procedure were made of stone rather than metal?