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Of all mammals, dogs have the greatest size diversity within their species. A large dog can be 80 times heavier than a small dog. A new study identifies a gene that may be responsible for these enormous size differences.

The 15 British sailors and marines Iran captured two weeks ago are home. Britain says it hopes to resolve any future disagreements peacefully.

Matthew Dowd, the chief strategist for President Bush's 2004 campaign, stunned many by telling The New York Times he has lost faith in the president and feels it is time to withdraw troops from Iraq.

The Senate voted Wednesday on a bill that would expand federal funding for embryonic stem-cell research. The bill passed 63-34. But President Bush has reiterated his plans to veto the legislation. Whether the Senate can override a veto is uncertain.

Richard Shryock, is chairman of Virginia Tech's Department of Foreign Languages and Literatures. He reflects on the impact of Monday's attacks, including the deaths of instructors Jamie Bishop and Jocelyne Couture.

David Halberstam, the Pulitzer Prize-winning journalist, died in a car crash Monday in California. He rose to prominence during the Vietnam War and went on to dissect many of the institutions of America in the second half of the 20th century.

At least three people died in an explosion at the Iraqi Parliament in Baghdad's heavily fortified Green Zone on Thursday.

Seung-hui Cho's "angry, depressed" behavior and writings alarmed a Virginia Tech professor and made others who knew him uncomfortable. A roommate says Cho's mother had these words about her son after one visit: "Help him."

The mood on campus and in Blacksburg, Va., is subdued as residents attempt to reconcile Monday's deadly attacks at Virginia Tech. We hear from an emergency room doctor who says that victims' multiple gunshot wounds led him to characterize a shooter who "aimed with intent to kill." We also hear from students and area clergy.

President Bush renews his vow to veto any spending bill for the war in Iraq that attempts to set a timetable for withdrawal of U.S. combat troops. Senate Majority Leader Harry Reid has said that if the timetable fails, he will move to cut off funding for the war by March 31 of next year.