Finding needles in a haystack is challenging because the haystack provides no clue at all about the needles. The Chinese culture describes such daunting situations with a similar metaphor but on a larger scale: finding a needle in an ocean!
CITATION STYLE
Chen, C. (2011). Cognitive Biases and Pitfalls. In Turning Points (pp. 43–67). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-642-19160-2_3
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