. >> we canning atively grow them and create baby corals, and venning yulely our goal is to put them> reporter: the fact these corals are thriving is leafing scientists baffled. >> so we could make a hypothesis that the corals have only be selected because the strongest survive. so these could be supercorals that may hold secrets for coral survival globally. >> reporter: sarah clark, al jazeera, hong kong. >>> more on our website, aljazeera.com. >>> demanding an investigation. doctors without borders wants answers as to why their hospital was hit in an another round of strikes against isil. russia steps up attacks as syrian ground forces step