Who is the most well-known, albeit controversial, ethicist in the philosophical world?

Peter Singer

Explanation:

Peter Singer is an Australian philosopher, an expert in applied ethics who advocated for abstaining from the use of animal products and preaching for helping the global poor. He came into controversy when he, in his book Practical Ethics, advocated for painless killing of a patient suffering from an incurable disease, especially severely disabled infants. This led to protests against Singer in Germany where his book was withdrawn from the course.  

In another controversy, Singer was criticized for defending a professor who was convicted of sexual assault of a man who was physically disabled and mentally challenged. Singer was criticized for his work Animal Liberation, which contains no valid philosophical arguments.

invention of the washing machine

in the past, people used sticks and stones or scrub boards to clean their clothing. as it was sweaty, backbreaking work, we owe a world of to james king because he created the model for the modern washing machine in 1851. the most important issue was that this machine cleaned clothes while a person cranked the handle. doing this made people who used it develop strong muscles in their arms. later, in 1908, alva j. fisher created an electric washing machine named thor. this one was not the first automatic washing machine. however, it was one of the most popular models at the time.