TIL The half-life of an isotope of Tellerium is 160 Trillion times greater than the Universe's Age (Aprox. 13.8 billion) . The very-long-lived radioisotope Tellerium-128 thus has the longest known half-life among all the Radionuclides of around 2,200,000,000,000,000,000,000,000 years!