ɪn nˈaɪntiːnhˈʌndɹɪd nˈaɪnti θɹˈiː, sˈaɪəntɪsts dɪskˈʌvɚd hˌaʊ tə mˌeɪk ɐ kˈɑːmpaʊnd wˌɪtʃ ɪz nˌɑːt æz səsˈɛptᵻbəl tə mˈɔɪstʃɚ ænd ˈɛɹ.
In 1993, scientists discovered how to make a compound which is not as susceptible to moisture and air.