Unsolved problems in science
A list of unsolved problems may refer to several conjectures or open problems in various fields:
5 Unanswered Questions That Will Keep Physicists Awake at Night
Physics is all about probing the most fundamental mysteries in nature, so it’s no surprise that physicists have some very basic questions about the universe on ...
The Biggest Unsolved Mysteries in Physics | Open Questions | LiveScience
The more we learn about the universe, the more questions seem to arise. Here are our picks for the biggest open questions remaining in the field of physics.
AI-complete
In the field of artificial intelligence, the most difficult problems are informally known as AI-complete or AI-hard, implying that the difficulty of these computational problems is equivalent to that ...
List of unsolved problems in biology
This article lists currently unsolved problems in biology.
Unsolved problems in chemistry
Unsolved problems in chemistry tend to be questions of the kind "Can we make X chemical compound?", "Can we analyse it?", "Can we purify it?" and are commonly solved rather quickly, but may just as we...
Unsolved problems in computer science
This article is a list of unsolved problems in computer science. A problem in computer science is considered unsolved when an expert in the field (i.e, a computer scientist) considers it unsolved or w...
Unsolved problems in economics
This is a list of some of the major unsolved problems, puzzles, or questions in neoclassical economics. Some of these are theoretical in origin and some of them concern the inability of orthodox econo...
Unsolved problems in linguistics
This article discusses currently unsolved problems in linguistics.Some of the issues below are commonly recognized as unsolved problems; i.e., it is generally agreed that no solution is known. Others...
Unsolved problems in mathematics
This article reiterates the Millennium Prize list of unsolved problems in mathematics as of October 2014, and lists further unsolved problems in algebra, additive and algebraic number theories, analys...
Unsolved problems in neuroscience
There are yet unsolved problems in neuroscience, although some of these problems have evidence supporting a hypothesized solution, and the field is rapidly evolving. These problems include:
Unsolved problems in philosophy
This is a list of some of the major unsolved problems in philosophy. Clearly, unsolved philosophical problems exist in the lay sense (e.g. "What is the meaning of life?", "Where did we come from?", "W...
Unsolved problems in physics
Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result. The others are experim...
Unsolved problems in statistics
There are many longstanding unsolved problems in mathematics for which a solution has still not yet been found. The unsolved problems in statistics are generally of a different flavor; according to Jo...
Unique games conjecture
In computational complexity theory, the Unique Games Conjecture is a conjecture made by Subhash Khot in 2002. The conjecture postulates that the problem of determining the approximate value of a certa...
Hilbert's seventeenth problem
Hilbert's seventeenth problem is one of the 23 Hilbert problems set out in a celebrated list compiled in 1900 by David Hilbert. It concerns the expression of positive definite rational functions as s...
Artificial intelligence
Artificial intelligence (AI) is the intelligence exhibited by machines or software. It is an academic field of study which studies the goal of creating intelligence. Major AI researchers and textbooks...
Cambrian explosion
The Cambrian explosion, or less commonly Cambrian radiation, was the relatively short evolutionary event, beginning around 542 million years ago in the Cambrian Period, during which most major animal ...
Manning Criteria
The Manning criteria are a diagnostic algorithm used in the diagnosis of irritable bowel syndrome (IBS). The criteria consist of a list of questions the physician can ask the patient. The answers are...
POPLmark challenge
In programming language theory, the POPLmark challenge (formerly Mechanized Metatheory for the Masses!) is a set of benchmarks designed to evaluate the state of mechanization in the metatheory of prog...
Gamma-ray burst
Gamma-ray bursts (GRBs) are flashes of gamma rays associated with extremely energetic explosions that have been observed in distant galaxies. They are the brightest electromagnetic events known to occ...
NP = co-NP problem
In computational complexity theory, co-NP is a complexity class. A decision problem is a member of co-NP if and only if its complement is in the complexity class NP. In simple terms, co-NP is the c...
P = PSPACE problem
In computational complexity theory, PSPACE is the set of all decision problems that can be solved by a Turing machine using a polynomial amount of space.
If we denote by SPACE(t(n)), the set of al...
Szymanski's conjecture
In mathematics, Szymanski's conjecture, named after Ted H. Szymanski (1989), states that every permutation on the n-dimensional doubly directed hypercube graph can be routed with edge-disjoin...
Baryon asymmetry
The baryon asymmetry problem in physics refers to the fact that there is an imbalance in baryonic matter and antibaryonic matter in the observable universe. Neither the standard model of particle phys...
Virtually fibered conjecture
In the mathematical subfield of 3-manifolds, the virtually fibered conjecture, formulated by American mathematician William Thurston, states that every closed, irreducible, atoroidal 3-manifold with i...
Poincaré conjecture
In mathematics, the Poincaré conjecture (/pwɛn.kɑːˈreɪ/ pwen-kar-AY; [pwɛ̃kaʁe]) is a theorem about the characterization of the 3-sphere, which is the hypersphere that bounds the unit ball in four-dim...
Nanobacterium
Nanobacterium (NAH-no-bak-TEER-ee-əm, pl. nanobacteria NAH-no-bak-TEER-ee-uh) is the unit or member name of a proposed class of living organisms, specifically cell-walled microorganisms with a size mu...
Modified Newtonian dynamics
In physics, modified Newtonian dynamics (MOND) is a theory that proposes a modification of Newton's laws to account for observed properties of galaxies. Created in 1983 by Israeli physicist Mordehai M...