You discover a bug the likes of which you’ve never seen. Is it dangerous? Before you scream and whack it with a shoe — OK, after the screaming part — scroll through the engrossing pictures on www.whatsthatbug.com. Two photographers run the site (they started it as an art project), and they consult regularly with entomologists. If you still can’t identify the creepy creature, e-mail a photo and they’ll try to tell you what it is. Then you can arm yourself with a sturdier shoe (or shoo the thing out the door).