At the famous Hippodrome de Longchamp just outside of Paris this month, crowds came to cheer and bet on the sleek thoroughbreds that opened horse racing season by galloping down the verdant turf course.
Horse racing in Europe is different from the sport in the U.S., from the shape and surface of the track to race distances and the season itself. Another big difference is doping.
Investigators in protective suits examine material on Boylston Street in Boston on April 18, three days after the deadly bombings. The explosive devices were relatively simple to make and law enforcement officials come across them on a regular basis, officials say.
As investigators look into the Boston Marathon bombings, one crucial question is whether the suspects, brothers Tamerlan and Dzhokhar Tsarnaev, acted alone or had help. The clues might be found in the bombs used.
From what is now known, it appears the brothers assembled a whole arsenal of explosives. Watertown Police Chief Edward Deveau told CNN last weekend that the suspects had at least six bombs, including the two used in the attack and one thrown at police during a shootout.
Humberto Manzano Jr. moves a pallet of goods at an Amazon.com fulfillment center in Phoenix in 2010. Amazon has endorsed a bill making its way through the Senate that would require more online retailers to collect sales tax.
More online retailers would have to collect sales tax under a bill making its way through the U.S. Senate this week. The measure won strong bipartisan backing on a procedural vote Monday, and President Obama has said he would sign it.
The political battle over the bill pits online retailers against brick-and-mortar stores — and, in some cases, against other online sellers.
An investigator inspects the area near a surveillance camera on the roof of the Lord & Taylor store near the Boston Marathon finish line on Thursday. That camera provided the first glimpse of the men who allegedly planted the bombs.
Footage from surveillance cameras along the Boston Marathon route gave the FBI early clues about the bombing suspects. And prosecutors say they'll use some of those images to try to prove their criminal case against 19-year-old Dzhokhar Tsarnaev. But the proliferation of cameras in America's big cities is raising some tricky questions about the balance between security and privacy.
It was pictures of two brothers taken by a camera outside the Lord & Taylor department store that provided the first glimpse of the men who allegedly bombed the Boston Marathon.
Harvard psychologist Mahzarin Banaji was once approached by a reporter for an interview. When Banaji heard the name of the magazine the reporter was writing for, she declined the interview: She didn't think much of the magazine and believed it portrayed research in psychology inaccurately.
But then the reporter said something that made her reconsider, Banaji recalled: "She said, 'You know, I used to be a student at Yale when you were there, and even though I didn't take a course with you, I do remember hearing about your work.' "
Local officials have defended the decision to essentially lock down the city of Boston on Friday while law enforcement searched for a suspect in the Boston Marathon bombing.
Residents were told to remain indoors during the hunt for Dzhokhar Tsarnaev, who survived an early morning shootout with police in the suburb of Watertown during which his brother, Tamerlan, was killed.
Massachusetts Gov. Deval Patrick announced the decision to lock down Watertown and the surrounding areas, including Boston, at a dawn news conference Friday.