"This is very exciting, clearly, because here we have somebody who can have anaphylaxis and deadly reaction from trace amounts, and you're converting this person into somebody who can tolerate a significant amount of the food, " said Dr. Anna Nowak-Wegrzyn, associate professor of pediatrics at Mount Sinai Medical Center in New York.

CNN: 'Exciting' advance reported in peanut allergy therapy

Rare stamps are like fingerprints: They're unique, and you can trace them as they've traded in auctions back almost a hundred years.

FORBES: Bill Gross On Stamp Collecting

It's almost a certainty that if you're listening to this program now you're using tiny electronic devices that can trace their heritage back to the mind of William Shockley.

NPR: Electronics Pioneer William Shockley's Legacy

Just ahead we're going to learn a little bit more about how to trace one's heritage with Gina Paige, president of African Ancestry.

NPR: Scholar Helps Black Americans Trace Family Roots

For example, a re-engineering of the Internet to make it easier to trace the location of cyberattackers, as some have called for, would surely be expensive, impractical and extremely harmful to privacy.

WSJ: Battling the Cyber Warmongers

We're in charge - albeit " without any triumphalism and with no trace of any political tribalism" and we've already got one.

BBC: Time to switch back on

We're in a crucial change state between the era of ephemeral talk and the era of the digital trace, where everything we do and say creates our own personal record.

CNN: Social media make us more honest