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Mollusk graveyards are time machines to oceans' pristine past
Mollusk graveyards time machines oceans pristine past
2017/3/14
A Florida Museum of Natural History study shows that mollusk fossils provide a reliable measure of human-driven changes in marine ecosystems and shifts in ocean biodiversity.Collecting data from ...
Within the context of general relativity, we consider one definition of a 'time machine' proposed by Earman, Smeenk, and Wuthrich (2009). They conjecture that, under under their definition, the class ...