This issue in focus.

• Author: Zack, Ian
• Position: Teacher's Guide - Common Core standards

Dear Teachers,

The Common Core standards place a lot of importance on using primary sources. Poring over the raw materials of history helps students strengthen their critical-thinking and analysis skills and approach material from multiple points of view.

After your class reads our article "Justice Denied," on civil rights era murder cases that remain unsolved today, go to Upfront's digital edition and download letters sent by the F.B.I. to the families of victims, telling them that the cases of their loved ones will most likely never be solved.

For the 50th anniversary of John F. Kennedy's...