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Technetium is the lightest element with all radioactive isotopes and the only radioactive element with stable neighbours. It was predicted by Mendeleev and discovered by Segrè and Perrier in 1937. Learn about its properties, history, isotopes and applications.
Plate tectonics is the scientific theory that Earth's lithosphere comprises a number of large tectonic plates, which have been slowly moving since about 3.4 billion years ago. The web page explains the key principles, types, and examples of plate boundaries, where the plates meet and interact with each other and the mantle.
Quantum entanglement is the phenomenon of particles being correlated in such a way that measuring one affects the other, even if they are far apart. Learn about the history, experiments, and applications of entanglement, and how it challenges classical physics.
Learn about the concept of eigenvalues and eigenvectors in linear algebra, and how they characterize linear transformations and matrices. Find definitions, examples, applications, history, and related topics.
Einsteinium is a synthetic, radioactive element with symbol Es and atomic number 99. It was named after Albert Einstein and discovered in 1952 as a byproduct of the first hydrogen bomb explosion.
A liquid-crystal display (LCD) is a flat-panel device that uses liquid crystals and polarizers to modulate light. LCDs are widely used in various applications, such as TVs, computers, watches, and mobile phones.
The swastika is an ancient symbol with various styles and meanings in different cultures, often associated with well-being, prosperity and divinity. Learn about its origin, etymology, religious significance, and its controversial adoption by the Nazi Party and other far-right groups.
Salem is a historic coastal city in Massachusetts, known for its seaport trade and the Salem witch trials of 1692. Learn about its Native American, colonial, and maritime heritage, as well as its museums, parks, and landmarks.