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Lists of unusual things in Wikipedia mainspace (see Category:Lists of things considered unusual) should have an external reference for each entry that specifically classifies it as unusual, to avoid making it a point of view (POV) fork of original research. Still, all such lists risk being deleted for lack of a neutral definition of what counts ...
Basic mathematics. This branch is typically taught in secondary education or in the first year of university. Outline of arithmetic. Outline of discrete mathematics. List of calculus topics. List of geometry topics. Outline of geometry. List of trigonometry topics. Outline of trigonometry.
Prevalence still unknown as of 2016. [ 40] Red Meat [ 41] Hives, swelling, dermatitis, stomach pain, nausea, vomiting, dizziness, fainting, shortness of breath, [ 42] anaphylaxis. Allergies to the sugar carbohydrate found in beef, venison, lamb, and pork called alpha-gal. It is brought on by tick bites. [ 43]
Birthday paradox: In a random group of only 23 people, there is a better than 50/50 chance two of them have the same birthday. Borel's paradox: Conditional probability density functions are not invariant under coordinate transformations. Boy or Girl paradox: A two-child family has at least one boy.
List of science and engineering blunders. Eppendorf & Science Prize for Neurobiology. List of scientific equations named after people. List of types of equilibrium. List of members of the European Academy of Sciences and Arts. List of existing technologies predicted in science fiction. List of experiments.
Lists of astronomical objects. Selection of astronomical bodies and objects: Moon Mimas and Ida, an asteroid with its own moon, Dactyl. Comet Lovejoy and Jupiter, a giant gas planet. The Sun; Sirius A with Sirius B, a white dwarf; the Crab Nebula, a remnant supernova. A black hole (artist concept); Vela Pulsar, a rotating neutron star.
List of cognitive biases. Cognitive biases are systematic patterns of deviation from norm and/or rationality in judgment. They are often studied in psychology, sociology and behavioral economics. [ 1] Although the reality of most of these biases is confirmed by reproducible research, [ 2][ 3] there are often controversies about how to classify ...
Size (left) and distance (right) of a few well-known galaxies put to scale. The following is a list of notable galaxies.. There are about 51 galaxies in the Local Group (see list of nearest galaxies for a complete list), on the order of 100,000 in the Local Supercluster, and an estimated 100 billion in all of the observable universe.