The "new riddle of induction" is a philosophical problem related to the justification of inductive reasoning, notably articulated by philosopher Nelson Goodman in 1955. Inductive reasoning involves making generalizations based on observed instances, such as concluding that all swans are white after seeing many white swans. However, Goodman's riddle challenges the criteria we use to classify observations and make predictions about the future. Goodman introduced the terms "grue" and "bleen" to illustrate his point.
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Nelson Goodman's challenge to explain why some predicates, rather than all predicates fitting the examined cases, are legitimate candidates for projection. It concerns projectibility, not a demonstration that every conceivable continuation is equally credible.[ref]
Fact, Fiction, and Forecast by Nelson Goodman. Chapter III, section 4