Where Is Everybody in Our Universe?
Two physicists contemplate life on other planets in this excerpt from "Exoplanets"
How the Tobacco Industry Lured Customers with Baseball Cards
With baseball season in full swing, learn about the game's entwined history with cigarettes
How the Smithsonian Conserved the Jefferson Bible
Thomas Jefferson cut and arranged selected Bible verses to create a chronological, edited story of Jesus' life—and the conservation treatment was just as painstaking