I think the greatest invention was... English Experts
We all can't deny it was a very good invention! It's here where I can practice my English, train my English and ask about Enlglish. Just to get where I wanna be, Harvard (or MIT)
Ok, being realistic, the best invention was the computer, the computer for me is my school, is my source of knowledges, I can learn everything here. More specific the Internet, like others said, I wouldn't get great grades without this amazing invention! I owe to it, after my graduation in Harvard
, after I get rich, I'll invest a lot of money in internet developing!