Assertion: uranium's life | /r/HasProperty | 4.5 billion years
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Source sentences:
text: The half-life of uranium-238 is 4.5 billion years.
text: its half-life is 4.5 billion years—and is fertile, not fissile, meaning it can’t sustain a chain reaction and thus can’t be used in atomic bombs like its much more dangerous brother, uranium-235.