However, the story does capture a version of the same phenomenon. In it, mankind of the near future uses a time machine to leap back thousands of years and hunt dinosaurs. Hunters cannot bring their prey back to the twentieth century, or even step foot on the prehistoric ground while on the hunt (they have built levitating pathways) because of the danger that tampering with the past could negatively influence the present. One hunt goes wrong and the hunter slips, stepping briefly off the pathway, and crushing a butterfly, before hopping back on. When he and his guides return to the present
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