Warren v. District of Columbia “is a District of Columbia Court of Appeals case that held that the police do not owe a specific duty to provide police services to specific citizens based on the public duty doctrine.” And Castle Rock v. Gonzales, is a United States Supreme Court case in which the Court ruled, 7–2, that a town and its police department could not be sued under 42 U.S.C. § 1983 for refusing to enforce a restraining order, even though the refusal led to the murders of a woman’s three children by her estranged husband.

“Osteo-odonto-keratoprosthesis also known as “tooth in eye” surgery, is a medical procedure to restore vision in the most severe cases of corneal and ocular surface patients. It includes removal of a tooth from the patient or a donor.” Essentially, your tooth is implanted in your cheek and once it grows a new blood supply it’s taken out and put in your eye to replace a bad cornea. Wikipedia

Dürer’s rhino is such an impressive instance of that (Wikipedia)