A tweet can reveal your location, an Apple Watch monitors your health, a grocery chain loyalty card allows the supermarket to track your purchases. All of this constitutes what Michael Chertoff describes as “digital exhaust”—data that we constantly and unconsciously emit. The challenge this poses is how to protect that data in an increasingly interconnected world.
On June 30, Donald J. Trump became the first US president to set foot in North Korea. Trump made history when stepped across a low concrete marker accompanied by North Korean leader Kim Jong-un and walked a few steps into the North. The two leaders agreed to have their negotiators resume an effort to reach what has so far been an elusive nuclear deal. US President Donald J. Trump, accompanied by North Korean leader Kim Jong-un, stepped into North Korea at the border village of Panmunjom on June 30. Trump is the first sitting US president to set foot in North Korea. (Reuters/Kevin Lamarque)