an earthquake?

what the foxtrot?! today, whilst i was teaching my chitlins the intricacies of faces, edges, and vertices and three-dimensional figures, there was a boom. sounded a bit like something fell upstairs. a lot of something. problem is, there's no upstairs above me. personally, i thought a transformer blew up and half-expected the power to go out or at least flicker.

come to find out it was an earthquake according to the usgs. ok, a mini-earthquake.

those wily army engineers! if they'd tried such silly things in florida, they'd be underwater.