Answer:
“Dr. Heidegger’s Experiment” by Nathaniel Hawthorne has several themes that are universal and relevant even today. Two of these themes are Aging and Mistakes and Morality.
Step-by-step explanation:
The theme of aging is developed through the four people called to Dr. Heidegger’s study who have known one another for more than fifty years. Each has been successful in some field of endeavor, but their successes were long ago.