what did hans oersted discovered in 1819?
Aluminium
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 These are a few curiosities such as frozen sleet and the " black spring " of 1771 . He also recorded the effects on the weather of the 1783 volcanic eruption of the Icelandic crater Laki . 

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 The Jeannette expedition was followed by the 1893 – 1896 Arctic expedition of Norwegian explorer Fridtjof Nansen aboard the Fram , which proved that the Arctic Ocean was a deep oceanic basin , uninterrupted by any significant land masses north of the Eurasian continent . 

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 In the spring of 1749 , Linnaeus could finally journey to Scania , again commissioned by the Government . With him he brought his student , Olof Söderberg . On the way to Scania , he made his last visit to his brothers and sisters in Stenbrohult since his father had died the previous year . The expedition was similar to the previous journeys in most aspects , but this time he was also ordered to find the best place to grow walnut and Swedish whitebeam trees ; these trees were used by the military to make rifles . The journey was successful , and Linnaeus ' observations were published the next year in Skånska Resa . 

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 The Danish astronomer Tycho Brahe was noted for his careful observations of the night sky from his observatory on the island of Hven . In 1572 he noted the appearance of a new star , also in the constellation Cassiopeia . Later called SN 1572 , this supernova was associated with a remnant during the 1960s . 

neutral
 Swedish chemist Jöns Jacob Berzelius ( 1779 – 1848 ) discovered a chemical element that he named after Thor – thorium . 
