this is the latestlatest, workers in chernobyl are marking the 26th anniversary of the accident there with another effort to limit the damage. they're building a new shelter to cover the one built after the disaster. they fear the old shell might collapse and release radioactive substances. the work got under way 26 years to the day after the reactor exploded during test. ukranian government officials plan to built an arch-shaped containment building more than 100 meters high. it will cover the shell around reactor number four. workers expect to complete construction in three years. ...