<p>Human and animal sunk costs often aren’t, and sunk cost bias may be useful on an individual level to encourage learning. Convincing examples of sunk cost bias typically operate on organizational levels and are probably driven by non-psychological causes like competition.</p>
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In 1963, two 17-year-old students decided to study insomnia and aimed to break the world record for staying awake for the maximum number of hours that was set by a DJ in Honolulu (260 hours).
A reported 39 participants still continued to play a musical instrument at the age of 82 and approximately two-thirds reported that they had played the piano as a child.