Predestined Primordial Promethium == 

 It essentially says 2.8×10−9 of all Pm-145 nuclei are predestined to α decay with a half life of 6.3×109 years, so many of those nuclei are still around from the beginning of the universe and all of them will eventually undergo α decay only. 

 This just doesn't sound right to me. First, I thought that the big bang at the start of the universe only formed hydrogen, helium and a little lithium. All other isotopes, including heavy radioactive ones with short half lives, are still regularly formed in supernovae. 

 Second, I know that certain isotopes can decay in more than one way, but I did not know that individual atoms of the same isotope were predestined to decay in a specific way. I thought that individual nuclei not in different metastable states are indistinguishable and memoryless; any given Pm-145 nucleus will usually β decay, but very rarely one will α decay instead. I'd like to have someone who knows far more about it than me check out this section.    

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