COPENHAGEN( Reuters)-Art conservators are assessing the damage to centuries-old paintings recovered from a blaze that destroyed Copenhagen's Old Stock Exchange this week, the National Museum of Denmark said on Thursday.As the blaze ripped through the 400-year-old Copenhagen landmark on Tuesday, passersby jumped off their bicycles to help firefighters, conservators and soldiers retrieve valuable paintings." It had to be fast," Nina Wajman, a curator at the National Museum of Denmark, told Reuters