In February 1965, the Federal Aviation Agency published a technical report by Bernard Vonnegut — the atmospheric scientist who, with General Electric, had pioneered silver-iodide cloud seeding two decades earlier, and the older brother of the novelist Kurt Vonnegut. The question on the table was a practical one that pilots had been asking for half a century: can we stop lightning from striking our airplanes?

Vonnegut's answer, buried in the abstract, was a quiet bombshell:

"Although the amounts of net or induced charge on the airplane are small compared to the amount of charge in the thundercloud, these charges can locally cause an appreciable intensification of the electric field of a thunderstorm. While some lightning discharges to airplanes may be attributable to chance alone, there are reasons to believe that the electric charges on the airplane may either attract or initiate lightning discharges. It does not appear to be feasible to produce a significant reduction in the probability of an airplane receiving a lightning discharge by any technique for controlling the charge on the airplane. The most promising solution to the hazards posed by lightning is to design airplanes so that they are capable of receiving discharges without damage."

Two ideas here were ahead of their time. The first was the claim that an airplane triggers its own lightning strikes — that the metal hull, sweeping through a charged region, locally concentrates the electric field enough to set off a discharge that might not otherwise have happened. In 1965 this was a contested hypothesis. Decades of in-flight measurement (especially the NASA F-106 storm-penetration program of the 1980s) confirmed it: roughly 90% of strikes to aircraft in flight are aircraft-triggered, not "natural" strikes the plane happened to be standing under.

The second idea was the engineering surrender that follows: stop trying to avoid the strike, and instead build the airplane to shrug it off. This is now orthodoxy. Modern aircraft are wrapped in a conductive Faraday cage — aluminum skin, or in the case of carbon-fiber jets like the 787, a thin embedded metal mesh — that channels the 200,000-amp pulse around the cabin and out a wingtip. Fuel tanks are designed so no spark can reach vapor. Avionics are shielded. Pilots are trained that a strike is a non-event; commercial airliners are hit, on average, about once a year each, and almost no one notices.

The forgotten part is how counterintuitive Vonnegut's conclusion was at the time. Engineers had spent years on static-discharge wicks, electrostatic dissipators, and conductive paints, all aimed at preventing the strike. Vonnegut's report said: that whole research program is a dead end. Spend the money on tolerance, not avoidance.

It's the same logic that eventually replaced "don't crash" with "crumple zones," and "don't get hacked" with "assume breach." Sometimes the lost knowledge isn't a technique — it's the moment someone first said out loud that the obvious goal was the wrong goal.