BRKELEY HEIGHTS, NJ - On September 11 this year, fifth graders at Mountain Park learned about the history of 9/11 and its effects on our country and the world.  They also discussed the many heroes who responded to the disasters at the World Trade Center and the Pentagon.  To honor the first responders of 9/11 and our very own first responders in Berkeley Heights, the fifth graders wrote thank-you letters to our police department, volunteer fire department, and volunteer rescue squad.