Natural Science and Technology
- PSI (computational chemistry), software
- PSI (prion), an infectious protein in yeast
- Psi (instant messaging client), a popular XMPP client program
- Pandemic Severity Index, by the US Centers for Disease Control and Prevention
- psi (pounds per square inch), a unit of pressure
- Photosystem I, a protein complex involved in photosynthesis
- Pneumonia severity index
- Pollutant Standards Index, an air pollution measure
- Porous silicon, a material
- Program Specific Information, part of the MPEG transport stream protocol
- Protocol for Stage Illumination, a communications protocol geared towards stage lighting and effects control
- Protein Structure Initiative, a structural genomics initiative of the U.S. NIGMS
- J/ψ meson, a subatomic particle
- Water potential, denoted Ψ, in physical chemistry, the potential energy of a water solution relative to pure water
- Wave function, denoted ψ, in quantum mechanics
- 'Yaw' angle, denoted ψ in aerospace engineering, the rotation angle of a vehicle around the vertical axis with the Tait-Bryan convention
- Prediction-based Semantic Indexing, Permutation based method introduced by Sahlgren and his colleagues to encode structured medical knowledge.
- Potentially Shippable Increment, an acronym used in Scrum (development)
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“Show me one thing here on earth which has begun well and not ended badly. The proudest palpitations are engulfed in a sewer, where they cease throbbing, as though having reached their natural term: this downfall constitutes the heart’s drama and the negative meaning of history.”
—E.M. Cioran (b. 1911)
“Magic is akin to science in that it always has a definite aim intimately associated with human instincts, needs, and pursuits. The magic art is directed towards the attainment of practical aims. Like other arts and crafts, it is also governed by a theory, by a system of principles which dictate the manner in which the act has to be performed in order to be effective.”
—Bronislaw Malinowski (1984–1942)
“The real accomplishment of modern science and technology consists in taking ordinary men, informing them narrowly and deeply and then, through appropriate organization, arranging to have their knowledge combined with that of other specialized but equally ordinary men. This dispenses with the need for genius. The resulting performance, though less inspiring, is far more predictable.”
—John Kenneth Galbraith (b. 1908)