> Most American homes share a leaky wall with their garage. A garage with shelves of highly toxic substances that offgas through the wall when the weather gets hotter.

I don't buy this... what substances exactly, and wouldn't this imply that spending any time in one's garage is extremely dangerous, given that the concentration must still be orders of magnitude higher inside than out.

Also, why is bathroom ventilation important? Nothing neurotoxic there, just gross.