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Moment of truth
More than 25 million people died in Europe from the bubonic plague (the black death) in five years, from 1347 to 1352.


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noble gas Chem.
See inert gas.

noble metal Chem.
A metal that is chemically very unreactive and is resistant to corrosion and oxidation. It is sometimes found in their native metallic states in nature. For example, gold, silver and platinum.

nova Astron.
A star that suddenly flare up, often by a factor of as much as 10 000. It can remain bright for a few days or even months before slowly fades back to its original luminosity. It is often the result of an explosion on the surface of a white dwarf star, caused by matter (such as hydrogen) falling onto its surface from the atmosphere of a binary companion star. Nova generally appears in regions close to the Milky Way. Nova may occur more than once on a particular star. These stars are known as recurrent nova.

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