"Without progressive thinking, the world would still be flat, the earth would still be the center of the universe and polio would still be a killer of children."
Wow! what a twist on reality. Progs think global warming is man made, like flat earththers, progs wont open their eyes to the truth.
The earth could be or could not be the center of the universe, we will never know because we will never know where the end of the universe is to establish a boundary(even globalwarmonger armeggedonheads "computer models" accept that science.
And for polio, lets just say that progs and eugenics have a long and miserable history, abortion kills more humans than polio ever did, DDt would save millions and millions of lives from malaria