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archaeologists find 300,000-year-old stone tools in saudi arabia
saudi arabia
anthropology
arabian peninsula
archaeology
fossil record
homo erectus
human ancestors
human migration
out of africa
paleoanthropology
paleoclimate
paleoecology
stable isotope
stone tools
技术
科学
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sciencespeak: lazarus taxon
中國
fossil record
fossils
history
history of science
lazarus taxon
metasequoia
paleontology
plant
plants
taphonomy
tree
科学
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