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Hace 19 horas · 17th Century. 1669 - In his book De solido intra solidum naturaliter contento Nicolas Steno asserted that, although the number and size of crystal faces may vary from one crystal to another, the angles between corresponding faces are always the same. This was the original statement of the first law of crystallography (Steno's law).
Hace 19 horas · By the end of the 17th century, researchers had developed practical means of generating electricity by friction with an electrostatic generator, but the development of electrostatic machines did not begin in earnest until the 18th century, when they became fundamental instruments in the studies about the new science of electricity.
Hace 19 horas · The timeline of human evolution outlines the major events in the evolutionary lineage of the modern human species, Homo sapiens, throughout the history of life, beginning some 4 billion years ago down to recent evolution within H. sapiens during and since the Last Glacial Period . It includes brief explanations of the various taxonomic ranks in ...
Hace 19 horas · 1950s. 1959 in art – Birth of Caio Fonseca, Death of Frank Lloyd Wright, Sir Jacob Epstein. 1958 in art – Frank Stella begins black pinstripe paintings; Birth of Brian O'Connor (artist) and Don Yeomans. 1957 in art – Death of David Bomberg, Diego Rivera, Jack Butler Yeats; Birth of Lawrence Paul Yuxweluptun.
Hace 19 horas · For at least 1,000 years the name Celt was not used at all, and nobody called themselves Celts or Celtic, until from about 1700, after the word 'Celtic' was rediscovered in classical texts, it was applied for the first time to the distinctive culture, history, traditions, language of the modern Celtic nations – Ireland, Scotland, Wales, Cornwall, Brittany, and the Isle of Man. 'Celt' is a ...
Hace 19 horas · In the second part of the 17th century, Europe and America experienced an epidemic of fear of witchcraft. People widely believed that the devil appeared at midnight in a ceremony called a Black Mass or black sabbath, usually in the form of a black animal, often a goat, a dog, a wolf, a bear, a deer or a rooster, accompanied by their familiar spirits , black cats, serpents and other black ...
Hace 19 horas · Die Liste von Stauanlagenunfällen einschließlich Dammbrüchen und kleineren Versagensfällen zeigt Unglücke in der Geschichte des Baus von Talsperren und sonstigen Stauanlagen. Insbesondere der plötzliche Bruch des Absperrbauwerks mit einer unkontrollierten Entleerung des Stausees oder Staubeckens kann eine Katastrophe erzeugen.
