The city is in final preparations for the Chicago Marathon this weekend. But will it be safe in light of what happened in Boston? Paris Schutz has the details. View a route map and information on street closures.

How Water Defined 19th Century Cities

As Chicago debates whether nonprofits should be allowed free water, we discuss the origins of the city's water system. Northwestern University's Carl Smith joins us with stories from his latest book, City Water, City Life.

We look at the charges against Dzhokhar Tsarnaev. What case can defense attorneys build for the suspect? What constitutional protections does he have? And how do terrorism cases differ from other charges? We have analysis.