ROME (Reuters) - The ancient Colosseum of Rome, where gladiators fought for their lives, is slanting about 40 cm (16 inches) lower on the south side than on the north, and authorities are investigating whether it needs urgent repairs. Experts first noticed the incline about a year ago and have been monitoring it for the past few months, ... Tests have also started to observe the effects that traffic on nearby busy roads may have on the monument. Professor Giorgio Monti, from La Sapienza's construction technology department, warned there may be a crack in the base below the amphitheatre. "The...