Tickling the Dragon's Tail, a 1946 failed experiment to test the exact point at which fissile material could be made critical, after which hands-on criticality experiments were discontinued in the United States
tˈɪklɪŋ ðə dɹˈæɡənz tˈeɪl, ɐ nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi sˈɪks fˈeɪld ɛkspˈɛɹɪmənt tə tˈɛst ðɪ ɛɡzˈækt pˈɔɪnt æt wˌɪtʃ fˈɪsaɪl mətˈɪɹiəl kʊd biː mˌeɪd kɹˈɪɾɪkəl, ˈæftɚ wˌɪtʃ hˈændzˌɔn kɹˈɪɾɪkˈælᵻɾi ɛkspˈɛɹɪmənts wɜː dɪskəntˈɪnjuːd ɪnðə juːnˈaɪɾᵻd stˈeɪts