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Airs Tuesday, Aug. 1, 2017 at 9 p.m. on KPBS TV

A searchable database of more than 500 billion words from millions of books published over the past four centuries is now online. Researchers say the tool is a powerful way to study cultural change.

Congresswoman Susan A. Davis has served the heart of San Diego in Congress since 2000, when she was one of only four Democratic challengers in the nation to defeat a Republican incumbent. Since then, she has consistently won re-election with over two thirds of the vote.

California Attorney General Kamala Harris has dramatically reversed herself today in the case of Sara Kruzan, who killed her pimp at age 16.

Did Texas execute an innocent man? That question, and the controversy surrounding it, continues to swirl around Gov. Rick Perry. Critics say the governor has tried to squelch an investigation into the case. Now the issue has moved to the forefront of Perry's effort to win re-election.

North Korea claims to have joined the nuclear club with an underground test Sunday night. Intelligence agencies say they detected a large explosion, but questions remain. How can you tell is an explosion was nuclear, how do you measure an underground detonation, and what do the numbers tell us?

The International Atomic Energy Agency failed to conclude definitively that the Islamic republic is engaged in a full-scale weapons program. But the agency said the evidence of hidden nuclear activity is growing, and the questions are deepening.

Israel has been conducting air strikes against Hamas targets in the Gaza Strip since Saturday. Conditions inside Gaza are very dangerous. Mkhaimer Abu Sada is a political science professor at Al-Azhar University in Gaza City. He says where he lives in northern Gaza it is not safe to walk around. He tells Steve Inskeep that "life is like hell here — it has been very bad here."

From Wall Street to Silicon Valley, there's widespread acknowledgment that Steve Jobs' close relationship to the Apple brand and the company's employees is something that can't easily be replicated. There's no guarantee Apple can create the next big thing without Jobs at the helm.

Dr. Raul Ruiz grew up in a trailer park in this poor district in Southern California’s interior. The son of Mexican farm workers, he studied medicine at Harvard and then returned to his community to focus on the health problems of a poor, Latino population.