List of unsolved problems may refer to several notable conjectures or

open problem In science and mathematics, an open problem or an open question is a known problem which can be accurately stated, and which is assumed to have an objective and verifiable solution, but which has not yet been solved (i.e., no solution for it is know ...

s in various academic fields:

Natural sciences, engineering and medicine

Unsolved problems in astronomy This article is a list of notable unsolved problems in astronomy. Some of these unsolved problems in astronomy are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result. The ...

Unsolved problems in biology This article lists notable unsolved problems in biology. General biology Evolution and origins of life *Origin of life. Exactly how, where, and when did life on Earth originate? Which, if any, of the many hypotheses is correct? What were the ...

Unsolved problems in chemistry This is a list of unsolved problems in chemistry. Problems in chemistry are considered unsolved when an expert in the field considers it unsolved or when several experts in the field disagree about a solution to a problem. Physical chemistry pr ...

* Unsolved problems in engineering * Unsolved problems in geoscience * Unsolved problems in medicine * Unsolved problems in neuroscience * Unsolved problems in physics

Mathematics, philosophy and information sciences

* Unsolved problems in mathematics *

Unsolved problems in statistics There are many longstanding unsolved problems in mathematics for which a solution has still not yet been found. The notable unsolved problems in statistics are generally of a different flavor; according to John Tukey, "difficulties in identifying ...

* Unsolved problems in computer science *

Unsolved problems in philosophy This is a list of some of the major problems in philosophy. Metaphilosophy Philosophical progress A prominent question in metaphilosophy is that of whether or not philosophical progress occurs and more so, whether such progress in philoso ...

* Unsolved problems in information theory

Social sciences and languages

* Unsolved problems in economics * Unsolved problems in fair division * Unsolved problems in linguistics

Natural sciences, engineering and medicine

Mathematics, philosophy and information sciences

Social sciences and languages

See also