Monday marks the arrival celebration of explorer Christopher Columbus to the Americas on Oct. 12, 1492.

Italian-Americans observe the day as a celebration of their heritage, but many students in public schools are learning very different lessons about Columbus than their parents did.
    
The new studies are based in multiculturalism, but critics worry that many of the lessons are too negative and not balanced or accurate.
    
One fourth grade class in Pennsylvania put Columbus on trial.  They charged him with misrepresenting the Spanish crown, and with theft.
    
The students found Columbus guilty and sentenced him to life in prison, calling him a "bad guy."