Why the "optimism bias" rules our hopes for the future
Briefly

Optimism can be defined as a psychological trait affecting behavior, generally consistent over time, with the possibility of increasing one’s level through understanding and effort.
While traits like optimism were once thought to stabilize in adulthood, emerging research suggests they may be modifiable through therapeutic interventions and conscious efforts to change.
The debate between nature and nurture in shaping traits like optimism reveals complexity, as both genetic predispositions and environmental factors intertwine to influence individuals.
Scientific studies, often using twins to parse the influences of genetics and shared environment, show that understanding the roots of optimism can help in its cultivation.
Read at Big Think
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