In the digital world, almost everything you do to communicate leaves a trace. Often, emails are stored on servers even after they're deleted. Phone calls create logs detailing which numbers connected, when and for how long. Your mobile phone can create a record of where you are.
If you're a journalist trying to protect a confidential source, this is a very difficult world to work in.
This week, North Carolina's governor signed a new law requiring a state-approved photo ID to cast a vote in a polling place and shortening the period for early voting. The move comes just weeks after the U.S. Supreme Court invalidated a key provision of the Voting Rights Act of 1965, which had required large parts of the state to get federal approval before changing voting laws.
Ancient North Americans gouged elaborate rock art into a heap of big boulders northeast of Reno, Nev., more than 10,000 years ago and perhaps 15,000 years ago. That makes the carvings the oldest known petroglyphs on the continent, according to a paper published in the Journal of Archaeological Science.
This is one of the most critical tests for a developing economy: balancing development and the protection of human rights. It's currently playing out on the national stage in Peru. Several members of the president's cabinet have just resigned over plans to expand a gas field. It's in an area populated by tribes of Indians who have no contact with the outside world. Here's NPR's South America correspondent Lourdes Garcia-Navarro.
The race to create a viable Internet-based TV service is on, and the contestants include the biggest names in computer technology: Apple, Microsoft, Intel and Google. Sony has apparently reached a deal — as preliminary — with Viacom to carry the company's cable channels on its planned web TV service.