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President Obama called House Speaker John Boehner in the morning but there was no breakthrough. Both later held news conferences to reiterate their positions.

The treatment would allow doctors to replace the genetic glitches in one human egg with healthy DNA from a donor egg. Ethicists are concerned because any changes to eggs or sperm could be passed on for generations to come.

President Obama is expected to name Janet Yellen to be the first woman to chair the Federal Reserve... Some Senate Democrats are warning they might have to go "nuclear" on the debt-ceiling... Piecemeal reopening of federal agencies would leave vast parts of the government closed.

Martin Karplus, Michael Levitt and Arieh Warshel pioneered powerful technology that is now used to develop drugs and perform other vital tasks in the laboratory.

President Obama and House Speaker John Boehner trade barbs, while some federal employees considered "essential" are working without a paycheck.

Also: Boehner says short-term shutdown deal would be 'unconditional surrender" and U.S. to cut some military aid to Egypt.

The three scientists sharing the 2013 Nobel Prize for chemistry developed computerized tools for studying complex molecules, such as enzymes and the photosynthesis machinery. These techniques allow engineers to design drugs and new chemical reactions more quickly and cheaply.

About 600 drivers went on strike Tuesday, leaving 30,000 students to find their own way to school.

The nomination of Janet Yellen as the most powerful central banker in the world symbolized President Obama's advantages in the current standoff with House Republicans and John Boehner, their titular leader.

Janet Yellen is being nominated as the new Federal Reserve chief. NPR Senior Business Editor Marilyn Geewax talks about what this news means.