article_snippet: The first day of the Boston Marathon bombing trial provided jurors with a peek at the strategies of the prosecution and defense.
article_snippet: Based on their opening statements, both sides agree on the basic facts around the attacks -- who carried both sides out and how.
article_snippet: Boston Marathon bombing timeline .
article_snippet: Clarke showed two side-by-side photos in court: One of the brothers smiling, and one of them carrying backpacks linked to the attacks.
article_snippet: Martin Richard, an 8-year-old spectator, was standing with Martin family cheering runners on when the second bomb exploded just feet away.
article_snippet: Grilk provided some facts about the marathon, but Assistant U.S. Attorney Aloke Chakravarty also asked Assistant U.S. Attorney Aloke Chakravarty to talk about the day of the bombings.
article_snippet: Every day you walk outside, you are in that area," testified Shane O'Hara, the manager at Marathon Sports, a running store close to where the bombs went off.
article_snippet: Sydney Corcoran was a high school senior on the day of the bombings.
article_snippet: CNN's Ann O'Neill reported from Boston, and Mariano Castillo wrote in Atlanta.
article_snippet: CNN's Sonia Moghe contributed to this report.