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YouTube is a web-based video streaming and sharing service, and social network. It launched in 2005 and quickly gained immense popularity, being bought by Google shortly after in 20006. Services have since been expanded to include live streaming.
An astronomer is a scientist who studies celestial bodies such as moons, planets, stars, nebulae, and galaxies); the physics, chemistry, and evolution of such objects; and phenomena that originate outside the atmosphere of Earth. A related but distinct subject, cosmology, is concerned with studying the universe as a whole.
A space-time crystal or four-dimensional crystal is a theoretical structure periodic in time and space. It extends the idea of a crystal to four dimensions. The idea was proposed by Frank Wilczek in 2012. His speculation was that a construct would have a group of particles that move and periodically return to their original state, perhaps moving in a circle, and form a time crystal. In order for this perpetual motion to work, the system must not radiate its rotational energy. This type of motion is distinct from that of persistent currents in a superconductor, wherein the rotating Cooper pair...
Software that is intentionally hostile or intrusive, often designed to cause data breach or damage to a computer resource
Mac OS is a series of graphical user interface-based operating systems developed by Apple Inc. for their Macintosh line of computer systems. The original version was the integral and unnamed system software first introduced in 1984 with the original Macintosh, and referred to simply as the System software. This is credited with popularizing the graphical user interface concept. Mac OS releases have existed in two series, Classic Mac OS from 1984 to 2000 and Mac OS X from 2001 to present.