// His team, in a world first, 3D-printed artificial reef tiles made from terracotta. They’re non-toxic and biodegradable. The team placed the tiles on the sandy bottom of a protected bay and seeded them with living coral, and 95% survived in the past two years. https://www.cbsnews.com/news/archireef-coral-reefs-hong-kong-startup-3d-printed-tiles/ //