Weekend Edition Saturday

After World War II, America became a superpower. New York experienced a global rise; Los Angeles was sprawling. But in a new book, Thomas Dyja writes that "the most profound aspects of American Modernity grew up out of the flat, prairie land next to Lake Michigan" — Chicago.

The Chapin Sisters are a critically acclaimed duo, with tinges of folk, country and pop in their songs. For their latest project, Lily and Abigail Chapin looked to another famous set of singing siblings: Don and Phil, The Everly Brothers.

Lily Chapin says the genesis of their new tribute album, A Date with The Everly Brothers, was a creative workaround of sorts. The duo was once a trio featuring another Chapin sister, Jessica; the three siblings grew up singing three-part harmonies together. Several years ago, Jessica left the group to start a family.

Since Egypt's revolution began, tensions among Egypt's Muslims and Christians have only increased. Earlier this month, it once again turned deadly. Tit-for-tat killings left three Muslims and at least six Christians dead.

That and other religious violence is prompting a public debate about religious identity in Egypt. One group of young Egyptians wants to remove religious labels from national ID cards.

'Where The Trouble Starts'

New York City Mayor Michael Bloomberg seems determined to become the formidable adversary the National Rifle Association has never had.

The billionaire mayor is spending from his personal fortune to help defeat lawmakers who voted against gun control proposals last week and to prop up those who supported the measures.

Bloomberg's first target is a Democratic senator facing a tough fight for re-election in 2014: Mark Pryor of Arkansas.

The grisly week that began at the Boston Marathon Monday left one police officer dead.

As police closed in on the bombing suspects Thursday night, law enforcement officials say two officers were shot. One, transit police officer Richard Donohue, is in critical condition at Mount Auburn Hospital.

The other, Sean Collier of the MIT campus police, was pronounced dead Thursday night.

MIT says Collier had gone to respond to a report of an altercation on campus Thursday evening. Soon, word came over the police radio that he had been shot.