It's a green leaf known to "generations of Eastern European housewives" and now it's under the microscopes of American scientists and the pest-control industry. Apparently, the housewives would spread a bunch of these bean leaves on the floor at night and...

...in the morning, the leaves would be covered with bedbugs that had somehow been trapped there. The leaves, and the pests, were collected and burned — by the pound, in extreme infestations.

So, of course, American companies want to make a synthetic version of these leaves, patents are pending, and so on. Unanswered by this story: Why not just use bean leaves?