 It's a lot of effort. In the end, we actually come home with a few cells. But, however, these cells have the potential to become emeralds and to form a new rhino, a huge two-ton animal. So, yeah, it is worth it. That report by our science editor, Rebecca Morrell, reporting there from Dublin Zoo in Ireland. You're listening to News Ad. Do stay with us. We've got lots more coming up in the second half of the break.