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A lone naked human is at a physical disadvantage to other comparable apex predators in areas such as speed, bone density, weight, and physical strength. Humans also lack innate weaponry such as claws. Without crafted weapons, society, or cleverness, a lone human can easily be defeated by fit predatory animals, such as wild dogs, big cats and bears (see Man-eater). However, humans are not solitary creatures; they are social animals with highly developed social behaviors. Early humans, such as Homo erectus, have been using stone tools and weapons for well over a million years. Anatomically modern humans have been apex predators since they first evolved, and many species of carnivorous megafauna actively avoid interacting with humans; the primary environmental competitor for a human is other humans. The one subspecies of carnivorous megafauna that does interact frequently with humans in predatory roles is the domestic dog, but usually as a partner in predation especially if they hunt together. Cannibalism has occurred in various places, among various cultures, and for various reasons. At least a few people, such as the Donner party, are said to have resorted to it in desperation.

For how long have humans been using stone tools and weapons?
Answer: well over a million years
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The period known as classical antiquity began with the rise of the city-states of Ancient Greece. Greek influence reached its zenith under the expansive empire of Alexander the Great, spreading throughout Asia.

What era started when Ancient Greek cities became self-governing entities?
Answer: classical antiquity
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On 17th Street (40°44′08″N 73°59′12″W﻿ / ﻿40.735532°N 73.986575°W﻿ / 40.735532; -73.986575), traffic runs one way along the street, from east to west excepting the stretch between Broadway and Park Avenue South, where traffic runs in both directions. It forms the northern borders of both Union Square (between Broadway and Park Avenue South) and Stuyvesant Square. Composer Antonín Dvořák's New York home was located at 327 East 17th Street, near Perlman Place. The house was razed by Beth Israel Medical Center after it received approval of a 1991 application to demolish the house and replace it with an AIDS hospice. Time Magazine was started at 141 East 17th Street.

What is unusual about the traffic between Broadway and Park Avenue South on 17th Street?
Answer:
runs in both directions