There is talk of a recount in Iran today as the streets are again filled with demonstrators responding to the re-election of President Mahmoud Amadinejad.  And questions are being raised about how this crisis might affect the Obama administration's efforts to open up a dialogue with the Islamic Republic.  We turn to Jonathan Marcus, the BBC's Diplomatic Correspondent in London for more.

Thembi Ngubane, the South African AIDS activist who documented her battle with the disease in diaries broadcast on National Public Radio, died last week at age 24 of complications from AIDS-related tuberculosis.  We revisit a conversation we had with Thembi and Radio Dairies producer Joe Richman from April 2006.

"Twitter Streams Break Iran News Dam" is the headline from the Agence France-Presse.   As the Iranian government continues to crack down on internet users, the messaging service Twitter is being widely used by protest groups.  We hear more from New York Times Columnist Noam Cohen.

23-year-old Kay Aull set up a do it yourself DNA lab in her closet!  The MIT graduate says with just $300 and a little bit of knowledge, almost anyone can start combing through their DNA.  She brings her lab equipment to our studio to show us how it all works.

We revisit a conversation we had with writer Elizabeth Stroud.  "Olive Kitteridge", her collection of 13 short stories set in small-town Maine was awarded this year's Pulitzer Prize for fiction.