The fewest number of U.S. middle and high school students are currently using tobacco products since the National Youth Tobacco Survey began in 1999.
Blood isn’t actually toxic to all male mosquitos. In at least one virus-carrying species, it may even help them live longer.
A mid-1850s act let the United States seize islands rich in bird guano. Those strategic outposts fueled the U.S. rise to power, a researcher says.