A certain radioactive substance has a half-life of 
years. Approximately how many years will it take so that only 
of the original amount remains? Round your answers to six decimal places.
Definitions:
Less Intelligent
A term, often considered pejorative, used to describe lower-than-average cognitive abilities or intellectual functioning.
Transference
A phenomenon in psychoanalysis in which a patient redirects feelings and desires, often unconsciously, from a person in their past to a new object, usually the therapist.
Gain-Loss Theory
A psychological concept suggesting that a person's attraction to others increases with signs of increasing interest from them, and decreases with signs of disinterest or hostility.
Halo Effect
A cognitive bias in which an observer's overall impression of a person, product, or company influences their feelings and thoughts about that entity's character or properties.
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