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Some philosophers suggest that the general direction of the course of history follows large patterns. According to one proposal, history is cyclic, meaning that on a sufficiently large scale, individual events or general trends repeat. Another theory asserts that history is a linear, teleological process moving towards a predetermined goal ...
They first appeared during the Triassic period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the evolution of dinosaurs is a subject of active research. They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201.3 mya and their dominance continued throughout the ...
The history of the Internet and the history of hypertext date back significantly further than that of the World Wide Web. Tim Berners-Lee invented the World Wide Web while working at CERN in 1989. He proposed a "universal linked information system" using several concepts and technologies, the most fundamental of which was the connections that ...
He was an audio-visual content editor for the journal Nature for a decade, is a frequent contributor to the newspaper The Guardian, hosts the BBC Radio 4 programme Inside Science, has produced several science documentaries and has published books related to genetics and the origin of life.
Despite the distinction between sexual orientation and gender, throughout history gay, lesbian and bisexual subcultures were often the only places where gender-variant people were socially accepted in the gender role they felt they belonged to; especially during the time when legal or medical transitioning was almost impossible. This acceptance ...
As a tie-in to the sequel episode "Ghostfacers", in which the owners of Hellhounds Lair create their own Ghost Hunters-style reality show, The CW set up Ghostfacers.com. [128] The Winchesters later visit this website in the fourth-season episode "It's a Terrible Life". Series tie-ins, however, extend beyond the internet.
Although tritium is volatile and biologically active, the health risk posed by a release is much lower than that of most radioactive contaminants, because of tritium's short half-life (12.32 years) and very low decay energy (~14.95 keV), and because it does not bioaccumulate (it cycles out of the body as water, with a biological half-life of 7 ...