Reference Terms
from Wikipedia, the free encyclopedia
Trebuchet
A trebuchet, also sometimes called a trebucket is a medieval siege engine, a weapon employed either to batter masonry or to throw projectiles over walls.
Note: The above text is excerpted from the Wikipedia article "Trebuchet", which has been released under the GNU Free Documentation License.
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Matter & Energy News
December 6, 2024
Dec. 2, 2024 — A theoretical study suggests that small black holes born in the early universe may have left behind hollow planetoids and microscopic tunnels, and that we should start looking within rocks and old ...
Nov. 12, 2024 — Global carbon emissions from fossil fuels have reached a record high in 2024, according to new ...
Nov. 6, 2024 — Thin, flexible device could help people with visual impairments 'feel' surroundings. Device comprises a hexagonal array of 19 actuators encapsulated in soft silicone. Device only uses energy when actuators change position, operating for longer ...
Oct. 23, 2024 — In the face of rising CO2 levels, scientists are searching for sustainable ways of pulling carbon dioxide out of the air, so-called direct air capture. A new type of porous material, a covalent organic framework (COF) with attached amines, stands ...
Latest Headlines
updated 12:56 pm ET
Dec. 6, 2024 — In fields ranging from immunology and ecology to economics and thermodynamics, multi-scale complex systems are ubiquitous. They are also notoriously difficult to model. Conventional approaches take ...
Dec. 6, 2024 — A team of interdisciplinary scientists has developed flexible fibers with self-healing, light-emitting and magnetic properties. The Scalable ...
Dec. 6, 2024 — A new way to produce fuels made from leftover fat can create biofuel as effective as diesel and 1000-times more efficiently than current methods a ...
Dec. 6, 2024 — Researchers developed biodegradable materials that could replace the plastic micro-beads now used in beauty products. The materials could also be used to encapsulate nutrients for food ...
Dec. 6, 2024 — Researchers have built a drone that can walk, hop, and jump into flight with the aid of birdlike legs, greatly expanding the range of potential environments accessible to unmanned aerial ...
Dec. 6, 2024 — A new study shows the benefits of coordinating the siting of solar farms, wind farms, and storage systems, taking into account local and temporal variations in wind, sunlight, and energy demand. This ...
Imaging Technique Allows Rapid Assessment of Ovarian Cancer Subtypes and Their Response to Treatment
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Dec. 3, 2024 — The hydrogen atoms of [4Fe-4S] type ferredoxin, one of the electron carriers, have been visualized and both experiments and calculations have ...
Dec. 5, 2024 — First-of-its-kind sensor monitors fluctuating proteins within the body in real time. In an animal study, device accurately tracked biomarkers of inflammation. Device also could track protein markers ...
Dec. 5, 2024 — Physicists have outlined the next 10 years of global research into the behavior of neutrinos, particles so tiny that they pass through virtually everything by the trillions every second at nearly the ...