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Genetic tests of mammoth remains have found a stark contrast in the sex ratio between sites where the animals died naturally and those associated with humans, offering hints about how our ancestors hunted

Some periods in Earth's history are so different from our own that they may as well belong to another planet. Many people are interested in the age of dinosaurs or the Ice Ages, but it is an intermediate world, the Miocene Epoch—a sort of "in-between" world, geologically speaking