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KLAUS D. PETER/ CC BY-SA 3.0 One day, doctors may be able to diagnose illnesses such as cancer through your breath.

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KLAUS D. PETER/ CC BY-SA 3.0 One day, doctors may be able to diagnose illnesses such as cancer through your breath.

DELPHINE BRUYERE/ CC BY-SA 3.0 Humans who lived two million years ago had hearing patterns like those of chimpanzees, according to new research out of Spain and South Africa.

JAMES ST. JOHN/ CC BY 2.0 Australopithecus africanus had hearing that was closer to chimpanzees’.

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JAMES ST. JOHN/ CC BY 2.0 Australopithecus africanus had hearing that was closer to chimpanzees’.

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DELPHINE BRUYERE/ CC BY-SA 3.0 Humans who lived two million years ago had hearing patterns like those of chimpanzees, according to new research out of Spain and South Africa.

CARISSA RODGERS/ CC-BY-2.0 A breach at Experian put the data of T-Mobile customers in danger.

OLYMPUS DIGITAL CAMERA

OLYMPUS DIGITAL CAMERA

OLYMPUS DIGITAL CAMERA

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CARISSA RODGERS/ CC-BY-2.0 A breach at Experian put the data of T-Mobile customers in danger.

TAKKK/ CC BY-SA 3.0 Fertilizer and animal waste are causing increased air pollution.

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TAKKK/ CC BY-SA 3.0 Fertilizer and animal waste are causing increased air pollution.

MEGAN DONNELLY / FOR THE NEWS-LETTER

A11 Smoking

MEGAN DONNELLY / FOR THE NEWS-LETTER

Courtesy of CATHERINE PALMER 860.000 Catholic pilgrims flock to the Benjamin Franklin Parkway in Philadelphia to hear Pope Francis.

Courtesy of CATHERINE PALMER Pope Francis visited Washington, D.C., New York and Philadelphia.

Courtesy of CATHERINE PALMER The two-hour Papal Mass was held in front of the Philadelphia Museum of Art on the Benjamin Franklin Parkway and attended by about 860,000.

By CATHERINE PALMER

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Courtesy of CATHERINE PALMER 860.000 Catholic pilgrims flock to the Benjamin Franklin Parkway in Philadelphia to hear Pope Francis.