According to Skunk Works , Lockheed couldn't get a contract for the stealth fighter because their predictions for the stealth capabilities were too good. The model test failed because the radar was reading the pole instead of the plane model on top of it. They needed to make a stealth pole to proceed. It's mostly geometry, actually. The stealth tech came from a paper that wasn't secret, just amazingly hard to read.
Bats use radar, of course.
They kept bouncing off the stealth planes. The LHE can finally close our World War II books. Old Business Negotiations are in progress with the local shelving company. We hope they don't go out of business in the mean time. Evidently once before a company burned down while we were in the process of buying stuff from them.