Europe How long would it take to clean Rome's Colosseum using toothbrushes?

A team of archaeologists and engineers hopes to find out just that. And their task could become a model for Italy's efforts to preserve its cultural monuments.

By , Correspondent

Riccardo De Luca/AP/File

Archaeologists embarking on the mammoth task of cleaning the Colosseum, the world’s most recognized Roman monument, have hit on a secret weapon: the humble toothbrush.