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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Science & Society News
August 27, 2025
Aug. 26, 2025 — Knee osteoarthritis is a major cause of pain and disability, but routine X-rays often do more harm than good. New research shows that being shown an X-ray can increase anxiety, make people fear exercise, and lead them to believe surgery is the only ...
Aug. 26, 2025 — Australian teachers are in crisis, with 9 in 10 experiencing severe stress and nearly 70% saying their workload is unmanageable. A major UNSW Sydney study found teachers suffer depression, anxiety, and stress at rates three to four times higher than ...
Aug. 25, 2025 — Researchers uncovered that the Maui wildfires caused a spike in deaths far higher than reported, with hidden fatalities linked to fire, smoke, and lack of medical access. They warn that prevention rooted in Native Hawaiian ecological knowledge is ...
Aug. 20, 2025 — In a health system where speed often replaces empathy, researchers highlight the life-changing power of listening. Beyond simple questions, values-driven listening—marked by presence, curiosity, and compassion—can transform both patients and ...
Aug. 19, 2025 — Scientists found that Great Salt Lake’s chemistry and water balance were stable for thousands of years, until human settlement. Irrigation and farming in the 1800s and a railroad causeway in 1959 ...
Aug. 16, 2025 — A new study reveals that an earthquake early warning system, similar to the USGS ShakeAlert used in California, Oregon, and Washington, could give Alaskan communities precious seconds to prepare before strong shaking hits. Modeling shows that towns ...
Aug. 16, 2025 — Chemical evidence from a stalagmite in Mexico has revealed that the Classic Maya civilization’s decline coincided with repeated severe wet-season droughts, including one that lasted 13 years. These ...
Aug. 14, 2025 — Cats can naturally develop dementia with brain changes strikingly similar to Alzheimer’s disease in humans, including toxic amyloid-beta buildup and loss of synapses. A new study shows these similarities could make cats valuable natural models for ...
Aug. 13, 2025 — Advanced computer modeling suggests that by 2080, waves driven by sea level rise could flood Ahu Tongariki and up to 51 cultural treasures on Rapa Nui. The findings emphasize the urgent need for protective measures to preserve the island’s ...
Aug. 12, 2025 — THC levels in cannabis have soared in recent years, raising the risk of psychosis—especially in young, frequent users. Studies reveal a strong connection between cannabis-induced psychosis and schizophrenia, making early cessation and treatment ...
Aug. 12, 2025 — A study finds that people are more open to plant-based eggs when they’re part of familiar foods, like pancakes, rather than served plain. While taste and appearance still favor regular eggs, vegan eggs score higher on environmental and ethical ...
Aug. 12, 2025 — AI is now a routine part of workplace communication, with most professionals using tools like ChatGPT and Gemini. A study of over 1,000 professionals shows that while AI makes managers’ messages more polished, heavy reliance can damage trust. ...
Latest Headlines
updated 12:56 pm ET
Aug. 21, 2025 — In the deserts of Ethiopia, scientists uncovered fossils showing that early members of our genus Homo lived side by side with a newly identified species of Australopithecus nearly three million years ...
Aug. 21, 2025 — Scientists have uncovered the world s earliest fossil showing both Neanderthal and Homo sapiens features: a five-year-old child from Israel s Skhul ...
Aug. 14, 2025 — Denisovans, a mysterious human relative, left behind far more than a handful of fossils—they left genetic fingerprints in modern humans across the globe. Multiple interbreeding events with distinct ...
Aug. 13, 2025 — UC Berkeley scientists found oxytocin is key for quickly forming strong friendships, but less critical for mate bonds. In prairie voles, a lack of oxytocin receptors delayed bonding and reduced ...
Aug. 13, 2025 — A sweeping international study has revealed that when faced with complex decisions, people across cultures—from bustling megacities to remote Amazon communities—tend to rely on their own judgment ...
Aug. 4, 2025 — New research led by Mass General Brigham reveals that people facing social challenges—like food insecurity, financial strain, and limited healthcare access—are two to three times more likely to ...
Aug. 3, 2025 — Every time someone snaps a wildlife photo with iNaturalist, they might be fueling breakthrough science. From rediscovering lost species to helping conservation agencies track biodiversity and ...
Aug. 2, 2025 — Long before evolution equipped them with the right teeth, early humans began eating tough grasses and starchy underground plants—foods rich in energy but hard to chew. A new study reveals that this ...
Aug. 1, 2025 — Women who drank heavily, even though they strongly wished to avoid pregnancy, were 50% more likely to become pregnant than those who drank little or not at all, according to new research. ...
Aug. 1, 2025 — Scientists have discovered the oldest direct evidence of betel nut chewing in Southeast Asia by analyzing 4,000-year-old dental plaque from a burial in Thailand. This breakthrough method reveals ...