I don't say I never use Facebook, but I often think about closing my account.

Holding our own government to account for the use of its power is, in my view, the highest mission of a U.S. news organization.

Companies that receive government information demands have to obey the law, but they often have room for maneuver. They scarcely ever use it.

Stuxnet, a computer worm reportedly developed by the United States and Israel that destroyed Iranian nuclear centrifuges in attacks in 2009 and 2010, is often cited as the most dramatic use of a cyber weapon.

Ordinary Geiger counters, worn on belt clips and resembling pagers, have been in use by the U.S. Customs Service for years.

For personal use, I recommend the free and open-source Truecrypt, which comes in flavors for Windows, Mac and Linux.