It's a great quiz idea. And while the actual inventor of this or that is often controversial the glaring issue is gravity. Newton didn't invent gravity. Pre-Newton people weren't all floating around the place all the time.
Hi there, thanks for your comment and for taking this quiz. There is a bit of controversy surrounding who made some things, but I went with the most known names. Also in the description I have a part which says who invented or discovered it
And thanks for including enough "Who is buried in Grant's Tomb?" questions to make up for the seven hardest questions. As for the eighth hardest, Ruth Handler did not come up with the idea for Barbie, but appropriated the design of Lilli, a German doll with a past, and named it after her daughter. But she paid for the rights, so I guess she can take credit for it too.