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City planner Jeff Speck says walking will remain a choice in most American cities for years to come, but that it's important to incentivize pedestrians. In his book, Walkable City, Speck says urban walks have to be useful, safe, comfortable and interesting.

Blood diamonds, as they were once known, helped fuel atrocities in both Sierra Leone and neighboring Liberia. While no longer termed "conflict diamonds," they remain a divisive issue for the small West African nation.

Nearly three weeks after Hurricane Sandy, nowhere has the wait to restore power been longer than on Long Island. Utility mismanagement has deep roots there, where consumers are still paying for abuses that started more than 50 years ago.

The mayor of New York City wants you to see what an hour's, a day's, a year's worth of NYC's carbon dioxide emissions would look like — if you could see them. The gas is normally invisible. So he's made a video, and it ain't pretty. Why would the mayor do this? What's it look like? See for yourself.

In Egypt, protests continue in reaction to President Mohammed Morsi's decree giving himself unchecked powers, even though Morsi has said the scope of those powers is limited. Questions remain over whether Morsi's powers are actually limited and whether he'll cede them if the country gets a new constitution, as he has promised. Renee Montagne talks with Tarek Masoud from Harvard's Kennedy School of Government for insight into the political crisis in Egypt.

Also: The Powerball jackpot drawing is tonight; managers are arrested after a Bangladeshi factory fire kills at least 100; former senator Bob Dole is hospitalized for a 'routine procedure'; and there's a winner in the Dancing With The Stars All Star Mirror Ball Competition.

When an NYU student got an email about a new tuition form, he sent it to his mom, asking "Do you want me to do this?" Little did he know he had hit reply all, not forward, and the email went to 40,000 students. The students saw opportunity: the chance to send whatever they wanted to everyone. One circulated a photo of Nicolas Cage. Others wrote, "How is everyone today?" and "Anyone have a pencil I could borrow?"

Nearly a month after Sandy, thousands of New Yorkers still don't have electricity because they're waiting for an electrician to repair and certify wiring that was damaged by flooding. Some local officials have called on City Hall to allow electricians certified outside the city to work there until the crisis abates, but the city hasn't budged.

Diplomats and analysts are discussing prospects for another round of nuclear talks between six world powers and Iran. Tehran seems interested, even sending signals about possible bilateral talks with the U.S. But analysts say the window for progress is small before Iran's election season kicks in next spring. Meanwhile a new push on sanctions is expected, possibly including the sale of Iranian gas — a sensitive subject for neighboring Turkey, which recently acknowledged that it has been essentially bartering Turkish gold for Iranian gas.

Also: Continuing Egyptian violence prompts U.S. to close embassy in Cairo; Treasury Secretary Geithner to meet with Congressional leaders; Britain releases investigation report into press ethics; and Starbucks releases a large specialty coffee priced at $7 per cup.