Costa Rica is a beautiful country. It’s a very popular summer destination, especially for eco-tours and swimming. Not only can you swim and relax on the beaches and hike mountains and beautiful trails ...

(Phys.org) -- German researchers studying shark teeth have found at least two species that have fluorinated calcium phosphate - mineral fluoroapatite, as a main component, one of the main ingredients ...

Sharks have been on this Earth for a very long time, with their origins dating back over 400 million years. Dinosaurs are thought to have first appeared only around 230 million years ago, and while ...