Another difference: After being dogged by privacy advocates, Google now anonymizes search results -- making them difficult, if not impossible, to trace back to an individual user -- after nine months.

CNN: IBM worries iPhone's Siri has loose lips

Many Israelis trace their roots back to Arabic-speaking countries, and this fusion is reflected in their creative cuisine.

BBC: Hunting for hummus in Israel

Friday's significance can trace its roots back to mid-April.

FORBES: Circuit City Bending To Blockbuster, Icahn

After analysing the genes of modern people, though, Dr Quintana-Murci reckons that most Indians, at least, trace their roots back to a parallel spread by sea, via southern Arabia.

ECONOMIST: Out of Africa, always something new | The

"Because mutations start occurring at regular intervals in these genes as soon as a new species evolves - like the ticking of a clock - we can use them to trace the evolutionary history of a species back to its time of origin, " said Dr Hedges.

BBC: Earth AP

The authorities are now looking for anything that might have been part of the explosive devices - bits of metal or sharp objects that they might be able to trace back to its owner or owners.

BBC: Forensics investigators decode the Boston bombings

The typical Viennese coffee house -- an elegant institution with high ceilings, marble-top tables and a stack of newspapers to make one linger over an impeccable black brew with a customary glass of water -- may be more famously known than its Ukrainian cousin, but to trace back the origin of the communal coffee space, you have to go to Lviv, a Medieval city in western Ukraine.

BBC: Tracing the coffee house revolution to its Ukrainian roots

Fiercely anti-immigrant, the Freedom Party (PVV), claims to trace its ideological roots back to the ideas of the Enlightenment and to defend them against culturally different newcomers.

ECONOMIST: Europe��s far right

Talk to any CEO or other successful person, and odds are he or she can trace the lessons they learned about teamwork, fair play, leadership and overcoming challenges back to Little League, Pee-Wee football or some other youth sport.

WSJ: Ref's death a consequence of lack of sportsmanship