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Fordham University graduate student Matthew Combs studies the DNA of New York City's rats. He found that rats living uptown are genetically distinct from rats living downtown.

The 83-year-old emperor hinted last year that he wanted to step down. However, Japanese law had no provision for imperial abdication until a new law was passed by parliament this summer.

Even though congressional Republicans formally set aside their Obamacare repeal-and-replace efforts this summer, there are big policy changes that could become law under pending tax proposals.

The men maintained an Instagram feed titled "Traveling Butts" and had posed for similar selfies at tourist sites around the world. They face fines and possible prison time in Thailand.

"Pope Francis was visibly moved as he met the refugees who fled a military crackdown in Myanmar to neighboring Bangladesh," NPR's Sylvia Poggioli reports from Dhaka, Bangladesh.

The U.S. military had around 18,000 troops in Syria, Iraq and Afghanistan at the end of last year. The official numbers have gone up in all three countries and now total about 26,000.

Also: The world's largest lithium ion battery is switched on in Australia; the latest on the Senate's tax overhaul bill; and a Pennsylvania man will stop playing "Taps" on speakers outside his house.

"This is history in the making," South Australia Premier Jay Weatherill said of the battery, which sits next to a wind farm. It was tapped early to support the power grid during a heat wave.

As the number of immigrants available for farm work has dwindled in California, many who are left are older, and suffer from health problems related to decades of difficult labor.

"More than double the number of days have passed where it would have been possible to rescue the crew," a navy spokesman said. "We will continue the search ... there will not be people saved."