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Harvard University's Lawrence Summers announces that he will resign at the end of the academic year. The move comes a week before the Faculty of Arts and Sciences was expected to take a second no-confidence vote on Summers, who has been criticized for his abrasive personality and intemperate remarks.

Since it was invaded three years ago, Iraq has lost more than $10 billion in oil revenues. Corruption and sabotage are largely to blame. And U.S. and Iraqi officials say insurgents are benefiting. But many say the Oil Ministry's own militia is at the heart of the problem.

The world's three most notorious terrorists have all released new tapes within the same week. Experts say it's more likely coincidence than a coordinated message. But some security analysts say the messages of Abu Musab Zarqawi, Osama bin Laden and Ayman al-Zawahiri could imply more than mere rhetoric.

Don't expect a pullout of U.S. troops from Iraq in the near future. An increase in sectarian violence and U.S. dependence on Middle East stability -- largely because of oil-supply concerns -- argue against leaving Iraq.

Supporters of stem-cell research in Missouri have likely turned in enough signatures to place a measure protecting stem-cell research on the ballot. But Sen. Jim Talent (R-MO) has announced he will oppose the measure -- a stance that pro-life groups had long requested.

New York Times environmental reporter Andrew Revkin has covered climate change and climate politics for 20 years. His new book The North Pole Was Here: Puzzles and Perils at the Top of the World is geared toward young adults.

The nation's emergency rooms are crowded and overwhelmed. A major investigation says hospital ERs, which can barely handle daily 911 calls, are far from ready to handle the mass casualties that a flu epidemic or terrorist strike might bring.

Thirty years ago, the uprising of a group of schoolchildren forever changed South Africa's history. What began as a protest against a government education policy became a watershed moment in the fight against apartheid.

For the first time since the U.S. led the recent invasion of Iraq, the House and Senate are both debating the war. In the House, Democrats are attacking the policies of President Bush, while Republicans are defending them as part of the war on terror.

Diagnoses of autism are on the rise, and one result has been the start of high-profile campaigns to raise money for research. Another trend has been far less noticed: an increase in self-advocacy groups that aren't pushing for a cure, but acceptance.