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Though it may sound distasteful, the ruins of toilets and sewer systems can be a treasure trove for researchers who want to know how early Romans lived and ate.

The president says he won't recertify the 2015 nuclear deal, giving Congress the option to reimpose sanctions and rewrite parts of the agreement.

Engineers at Dartmouth College have developed a computer chip that can detect a single particle of light. Cameras with the chip would have visual abilities even a superhero would envy.

After more than a year of investigations into bribery, fraud and breach-of-trust allegations, officials have recommended that prosecutors pursue the cases.

Purdue Pharma, maker of OxyContin, won't promote opioids to doctors anymore. In Maine, physicians say the change should have happened long ago.

Javier Palomarez, president and CEO of the United States Hispanic Chamber of Commerce, has also been accused of financial impropriety.

The Trump administration wants to slash funding for the Department of Housing and Urban Development, including deep cuts to the federal housing subsidy known as Section 8.

Computer programs known as neural networks learn by example. So a researcher plugged in some typical Valentine's Day candy heart messages — and got some weird new word combos. "BEAR WIG," anyone?

Musk's successful rocket launch is a step on the ambitious road to Mars; as with our adventurous ancestors, where we might go seems to be limited only by our imagination, says Marcelo Gleiser.

At Karachi's annual Literature Festival, many of Pakistan's problems are being debated, in a climate that increasingly limits free speech.