To solve a problem in a way that creates another problem, often of equal nature and severity.

An insignificant problem of a privileged person.

A type of thought experiment in ethics and psychology, involving ethical dilemmas of whether to sacrifice one person to save a larger number.

(computing) The problem of how to create a superintelligent AI whose values would align with the interests of humankind.

(physics, engineering) Any estimation problem designed to teach dimensional analysis or the approximation of extreme scientific calculations: often a back-of-the-envelope problem with limited data.

The problem of finding a concept of a taxonomic species that can be usefully applied to many very different types of organism.

(mathematics) The problem of finding integer values of n and m for which n!+1=m², where n! is the factorial.

(philosophy) A problem arising from the tension between the seemingly irreducible nature of consciousness, and its ubiquity. If consciousness is ubiquitous, and every atom (or every bit, depending on the theory) has a minimal level of it, then it is not clear how these tiny consciousnesses combine to create larger experiences.

(philosophy) A thought experiment, asking, "if a man born blind can feel the differences between shapes such as spheres and cubes, could he, if given the ability to see, distinguish those objects by sight alone, in reference to the tactile schemata he already possessed?"

(Internet slang, derogatory) Women's-style glasses (prescription or not) that are interpreted as signaling a prissy demeanor, especially ones that point upwards and outwards or have colorful frames.