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These protocols were established, in part, by businessman Charles Hatton Ben Kingsley who has recently developed a time tourism service called Time Safari. For an extraordinary price, Time Safari will take clients through a wormhole to a time in pre-history to hunt dinosaur game. Scientist Travis Ryer Edward Burns is the designated leader for these safari expeditions, along with several other guides. Only creatures that are doomed to perishsuch as dinosaurs about to die in a volcanic eruptionare downed by safari patrons. According to the guides, this ensures that Earth’s evolutionary timeline will not be disturbed. The safari participants embark on their time tours wearing camouflage fatigues, helmets with sealed faceplates like astronauts, and armed with rifles that fire frozen-nitrogen bullets that dissolve so as not to leave behind evidence another precaution to avoid disturbing the timeline. The wormhole itself creates a path that physically separates the party from touching the ground, and on which they must all remain or risk breaking one of the protocols.

Excerpt Taken From http://en.wikipedia.org/wiki/A_Sound_of_Thunder_(film)

Topic – A Sound Of Thunder