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Helium
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| Heike Kamerlingh Onnes | | Liquified Helium |
(1853-1926), Netherlands. His efforts to reach extremely low temperatures culminated in the liquefaction of helium in 1908. Bringing the temperature of the helium down to 0,9°K, he reached the nearest approach to absolute zero then achieved, thus justifying the saying that the coldest spot on earth was situated at Leyden.
| Blue Throatwort | | Trachelium |