I just voted for those I was 99% to 100% sure of. Gravity, PMS, Man on the Moon, Planets rotating around the sun, continental whatever. Some I don't know enough about.
I don 't believe that time travel is possible any way you slice it. The past is over, the future hasn't happened yet so how could you go there? If we are descended from fish-monkey- things why aren't there any around today?
I definitely believe in diseases of the mind. There are so many things about the brain we don't understand.