Reference Terms
from Wikipedia, the free encyclopedia
Vehicle propulsion
Propulsion is a means of creating force leading to movement.
A propulsion system has a source of mechanical power (some type of engine or motor, muscles), and some means of using this power to generate force, such as wheel and axles, propellers, a propulsive nozzle, wings, fins or legs.
Other components such as clutches, gearboxes and so forth may be needed to connect the power source to the force generating component.
The term propulsion is derived from two Latin words: pro meaning before or forwards and pellere meaning to drive.
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October 6, 2025
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Sep. 29, 2025 — Researchers found that middle-aged adults, especially women, are far more likely to be addicted to ultra-processed foods than older generations. Marketing of diet-focused processed foods in the 1980s may have played a major role. Food addiction was ...
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Sep. 24, 2025 — Rice, a staple for billions, is one of the most resource-hungry crops on the planet—but scientists may have found a way to change that. By applying nanoscale selenium directly to rice plants, researchers dramatically improved nitrogen efficiency, ...
Sep. 24, 2025 — Researchers reviewing 46 studies found evidence linking prenatal acetaminophen (Tylenol) exposure with higher risks of autism and ADHD. The FDA has since urged caution, echoing scientists’ advice ...
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Sep. 22, 2025 — A team at RMIT University has created a cement-free construction material using only cardboard, soil, and water. Strong enough for low-rise buildings, it reduces emissions, costs, and waste compared to concrete. The lightweight, on-site process ...
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Oct. 6, 2025 — Despite massive technological and industrial changes, American cities have stayed remarkably coherent in how their economies fit together. This hidden order governs how cities diversify, grow, and ...
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Oct. 2, 2025 — Gaslighting, often seen as a form of manipulation, has now been reframed by researchers at McGill University and the University of Toronto as a learning process rooted in how our brains handle ...
Sep. 24, 2025 — Æthelstan, crowned in 925, was the first true king of England but remains overshadowed by Alfred the Great and later rulers. A new biography highlights his military triumphs, legal innovations, and ...
Sep. 23, 2025 — NASA has chosen 10 new astronaut candidates who will train for missions to the Moon and Mars. Their selection represents a powerful blend of talent and ambition, fueling humanity’s next great leaps ...
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Sep. 19, 2025 — What started as a frustrating kitchen challenge turned into award-winning science: Fabrizio Olmeda and his colleagues scientifically decoded the secret of creamy cacio e pepe and earned the Ig Nobel ...
Sep. 16, 2025 — Preschoolers with ADHD are often given medication right after diagnosis, against medical guidelines that recommend starting with behavioral therapy. Limited access to therapy and physician pressures ...
Sep. 15, 2025 — A groundbreaking project is piecing together Leonardo da Vinci’s genetic profile by tracing his lineage across 21 generations and comparing DNA from living descendants with remains in a Da Vinci ...