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What if you put all 7 billion humans into one city, a city as dense as New York, with its towers and skyscrapers? How big would that 7 billion-sized city be? As big as New Jersey? Texas? Bigger? Are cities protecting wild spaces on the planet? We try a little experiment to find out.

The FBI wants to speak with "Misha," a man who relatives of the suspects say may have introduced Tamerlan Tsarnaev to radical Islam. Meanwhile, Dzhokhar Tsarnaev reportedly stopped giving information to investigators after being read his Miranda rights.

Elected in 1956, Wisconsin state Sen. Fred Risser is the longest-serving state lawmaker in the country. He may not use Facebook, Twitter or email, but he's gotten a lot done over the years. Considered an "institution within an institution" by some, he was just re-elected for another four years.

Joe Sacco has made a career of tackling difficult subjects through imagery. He's a journalist and cartoonist who has reported on the Middle East and Bosnia — in both written and comic form. In his latest book, The Great War, Sacco turns to history, producing a 24-foot-long depiction of the horrifying first day of the Battle of the Somme.

Former Sen. Bob Dole has returned home to Kansas for a "thank you" tour. NPR's Rachel Martin speaks with the 90-year-old senator about his career.

First came the day trips for foreigner tourists to the shantytowns. Now, young Westerners are living in formerly no-go areas — with yoga classes and sushi restaurants following. Business is booming in Rio de Janeiro's favelas, but some residents complain they're being priced out of the market.

Famed fashion icons Bethann Hardison, Iman and Naomi Campbell have joined a coalition that presses for more diverse representation on the runway. The group has sent a letter to the governing bodies of the fashion world calling out specific designers for their lack of diversity.

John Lewis is a congressman from Georgia, a pillar of the civil rights movement and an author. Lewis is getting ready to release March, the new graphic novel of his life.

Defense Secretary Chuck Hagel proposes cutting the size of the Army and taking steps that trim military pay and benefit costs. "We must now adapt, innovate and make difficult decisions," he says.

As 2013 begins with wealthy Americans in line for bigger tax bills, they're not alone. Tax fairness takes the spotlight worldwide this year, as cash-strapped governments look to impose more of the burden on well-heeled companies, individuals and institutions, and to catch and punish tax cheaters.