New Scientist: Giant deep-sea corals don’t get around much, but what they lack in mobility they make up for in longevity. A new study has discovered that some coral colonies can “live” for more than 4000 years, showing that the animals grow far more slowly than was thought. It is this extremely slow growth that is the secret of the corals’ long life, says Brendan Roark, at Texas A&M University. The finding may have grave implications for the conservation of the corals’ ecosystems. “Because …