Hoover abused his power as FBI director to serve presidents' interests. The reforms that followed were set up to prevent it from happening again.
The best way to protect a presidential device is to keep it off the internet altogether. If that's not going to happen, how else can such a sensitive gadget be kept safe?
Innovation is a huge part of economic growth – and the White House needs to be well-informed on science and tech issues when setting goals and budgets. Here's how presidents get up to speed.