No, 41% of US Adults do not believe that dinosaurs and humans coexisted.
Salty water does boil quicker, you’re just not going to notice the difference unless you add a big handful. Completely different than just saying it doesn’t do anything.
Flushed water depends on the direction of the jets in the toilets.
The dogs sweating one seems like a quibble. I think what most of us heard/understood is that dogs can't sweat (because of the fur), so they use their mouths/tongue. Okay, apparently they can sweat through their foot pads, but since those are on the ground I doubt they're getting much evaporative cooling there. This says they regulate temperature through panting, which seems awfully close to the "myth."