MEXICO CITY—A new museum and conservation center dedicated to Mexico’s critically endangered axolotl salamander is highlighting the amphibian’s remarkable story that has captured the attention of scientists and the public alike. With an impressive ability to heal itself, the axolotl salamanders were showcased in the exhibit, which opened on Saturday, at Mexico City’s Chapultepec Zoo….

Death is defined as the termination of all biological functions that sustain a living organism. Brain death, the complete and irreversible loss of brain function (including involuntary activity necessary to sustain life) as defined in the 1968 report of the Ad Hoc Committee of the Harvard Medical School, is the legal definition of human death…