Nuclear war, the black swan we can never see

Nuclear war, the black swan we can never see | Bulletin of the Atomic Scientists: "Several centuries ago in England, the black swan was a popular symbol for the impossible because no such creature had ever been seen. Then came the surprise: Black swans were discovered in Australia. Since then, the bird has symbolized that which seems impossible but can in fact occur. The black swan reminds us that believing something cannot happen is often just a failure of imagination."