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Christopher Columbus [b] (/ k ə ˈ l ʌ m b ə s /; [2] between 25 August and 31 October 1451 – 20 May 1506) was an Italian [3] [c] explorer and navigator from the Republic of Genoa who completed four Spanish-based voyages across the Atlantic Ocean sponsored by the Catholic Monarchs, opening the way for the widespread European exploration and colonization of the Americas.
Existing laws banning abortion except for medical reasons were strictly enforced by the Nazi regime. The number of abortions declined from 35,000 per year at the start of the 1930s to fewer than 2,000 per year at the end of the decade, though in 1935 a law was passed allowing abortions for eugenics reasons. [374]
The thin disk of our galaxy began to form at about 5 billion years (8.8 Gya), [12] and the Solar System formed at about 9.2 billion years (4.6 Gya), with the earliest traces of life on Earth emerging by about 10.3 billion years (3.5 Gya).
1–1.6% of Russian population [15] 1918–1922 Russia: 11 1957–1958 influenza pandemic: Influenza A/H2N2: 1–4 million – 1957–1958 Worldwide 12 Hong Kong flu: Influenza A/H3N2: 1–4 million – 1968–1969 Worldwide 13 Cocoliztli epidemic of 1576: Cocoliztli 2–2.5 million 50% of Mexican population [13] 1576–1580 Mexico 14
History (derived from Ancient Greek ἱστορία (historía) 'inquiry; knowledge acquired by investigation') [1] is the systematic study and documentation of human past. [2] [3]
Prandtl number: 100 3.4388 1.07 ... the signal-to-noise ratio for 1 H is about 300 times as much as ... and blow the walls of the laboratory 0.1–0.2 m off their ...
From ancient times, people suspected that the climate of a region could change over the course of centuries. For example, Theophrastus, a pupil of Ancient Greek philosopher Aristotle in the 4th century BC, told how the draining of marshes had made a particular locality more susceptible to freezing, and speculated that lands became warmer when the clearing of forests exposed them to sunlight.
Pie chart showing the proportion of lurkers, contributors and creators under the 90–9–1 principle. In Internet culture, the 1% rule is a general rule of thumb pertaining to participation in an Internet community, stating that only 1% of the users of a website actively create new content, while the other 99% of the participants only lurk.