Dmitri Mendeleev presented the first periodic table.
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Kangaroo fossil research showed that they may have learned to hop over 20 million years ago.
Researchers identified the earliest known prehistoric ancestor of humans.
The idea of the Big Bang Theory being the creation of the universe was supported by scientists.
Ether was used as an anesthetic for the first time, by American surgeon Crawford Long, in Athens, Georgia.
A Duke University neuroscientist connected two rat brains together over the internet.
