Gregory, thanks so much for talking with us.

NPR: Obama Administration Turns Attention Toward Africa

So we've called upon Gregory Mankiw who was chairman of President George W. Bush's Council of Economic Advisors from 2003 to 2005, now a professor of economics at Harvard, an author and a blogger.

NPR: The Pressures Of Working In The White House

Mr. GREGORY MANIATIS (Migration Policy Institute): So we know, for instance, that in India about a third of the Internet startups there have been created by Indians who were in Silicon Valley in the '90s and the early parts of this decade.

NPR: U.N. Puts Spotlight on Global Immigration

Pope Gregory XII - who reigned from 1406 to 1415 - did so to end what was called the Western Schism.

BBC: How does a Pope resign from office?

So products that protect against market crashes are richly priced, says Gregory Peterson, a mathematician at Ballentine Partners who helps wealthy families manage risks.

FORBES: Magazine Article

Catholics grew so angry at the cardinals' indecision from 1268 to 1271, when Gregory X was elected, that they boarded them up in their chamber and tore off the roof to expose them to the elements.

CNN: Abuse victims' group names preferred picks for new pope

The so-called Meridian Hall, created to verify the accuracy of the calendar Pope Gregory XIII promulgated in 1582, is in the Vatican Secret Archives, which hold some 10m documents stored by the papacy over the past 1, 200 years.

ECONOMIST: The Vatican turns a page��slowly

According to Gregory Gratson, a researcher at the University of Illinois Urbana-Champaign, the printing process is quite benign, so living cells grown in culture should be able to survive it.

ECONOMIST: MONITOR