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...ossils of ''Pithecanthropus erectus'' (now ''Homo erectus'') found in Java in 1891. Estimated to be between 700,000 and 1,000,000 years old, at the time ...d in 1891 at [[Trinil]] – [[Ngawi Regency]] on the banks of the Solo River in [[East Java]], [[Indonesia]], one of the first known specimens of [[Homo er ...

...> It is regarded as one of the three most important works on [[mechanics]] in the 17th century, the other two being [[Galileo Galilei|Galileo]]’s ''[[Dis ...f name="jgy">{{citation|last=Yoder|first=Joella G.|title=Landmark Writings in Western Mathematics 1640-1940|year=2005|chapter=Christiaan Huygens book on ...

...Ole Rømer.jpg|thumb|[[Ole Rømer]] (1644–1710) became a government official in his native [[Denmark]] after his discovery of the [[speed of light]] (1676) ...Olaus".</ref> who was working at the [[Paris Observatory|Royal Observatory in Paris]] at the time. ...