Assertion: decay's life | /r/HasProperty | existent
Facets:
value: virtually
type: DEGREE
value: in nature
type: LOCATION
Source sentences:
text: The rarer Uranium-235 (0.72% of all Uranium) has a half life of 704 million years and Plutonium-239 which is virtually non existent in nature has a half life of 24 thousand years.