Anyone who wants to marvel at the northern lights can now do so not only in Norway, Finland and Iceland, but also in Singapore, where city gardens have engineered an artificial aurora borealis spectacle using lasers and machine-made clouds. A new light installation entitled "Borealis" is launching on May 5 in Singapore's nature park Gardens by the Bay. The centrepiece of the park are a group of so-called Supertrees - 18 futuristic tree-like constructions with more than 160,000 plants growing on