the imponderable gap

The gap between those who deal with biology and those who deal with technology is wider than you think! This note expresses one of the rare cavils we have received from a guest at our bed and breakfast:

"It took us a while to get our heads wrapped around the composting toilets."

And yet our written instructions stated clearly that you're supposed to sit on them! Really!

('Wrap their heads' around the toilets? The weird thing is it sounds like they eventually succeeded.)