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  2. Black Death - Wikipedia

    en.wikipedia.org/wiki/Black_Death

    25,000,000 – 50,000,000 (estimated) The Black Death was a bubonic plague pandemic occurring in Europe from 1346 to 1353. It was one of the most fatal pandemics in human history; as many as 50 million people [2] perished, perhaps 50% of Europe's 14th century population. [3] The disease is caused by the bacterium Yersinia pestis and spread by ...

  3. Dark matter - Wikipedia

    en.wikipedia.org/wiki/Dark_matter

    For example, if the average neutrino mass were over 50 eV/c 2 (less than 10 −5 of the mass of an electron), the universe would collapse. CMB data and other methods indicate that their average mass probably does not exceed 0.3 eV/c 2. Thus, observed neutrinos cannot explain dark matter.

  4. Sodium hydroxide - Wikipedia

    en.wikipedia.org/wiki/Sodium_hydroxide

    Physical properties. Pure sodium hydroxide is a colorless crystalline solid that melts at 318 °C (604 °F) without decomposition and boils at 1,388 °C (2,530 °F). It is highly soluble in water, with a lower solubility in polar solvents such as ethanol and methanol. [14] Sodium hydroxide is insoluble in ether and other non-polar solvents.

  5. Titan (moon) - Wikipedia

    en.wikipedia.org/wiki/Titan_(moon)

    Titan is one of the seven gravitationally rounded moons of Saturn and the second-most distant among them. Frequently described as a planet-like moon, Titan is 50% larger (in diameter) than Earth's Moon and 80% more massive. It is the second-largest moon in the Solar System after Jupiter's moon Ganymede, and is larger than Mercury, but only 40% ...

  6. Daily Mail - Wikipedia

    en.wikipedia.org/wiki/Daily_Mail

    t. e. The Daily Mail is a British daily middle-market tabloid newspaper published in London. It was founded in 1896. As of 2020, it was the highest paid circulation newspaper in the UK. [5] Its sister paper The Mail on Sunday was launched in 1982, a Scottish edition was launched in 1947, and an Irish edition in 2006.

  7. Decibel - Wikipedia

    en.wikipedia.org/wiki/Decibel

    Decibel. The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel ( B ). It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. Two signals whose levels differ by one decibel have a power ratio of 10 1/10 (approximately 1.26) or root-power ratio of 10 1/20 (approximately 1.12 ).

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