"the day we found the sharks' teeth" i would say highlight the element of the plot as it sets its boundaries and centers the adventures of them being on a boat and cleaning spit of sand.
martians or other types of aliens represent a unique fear as opposed to zombies. vampires and other types of monsters. in most sci-fi stories, aliens come from other worlds and have different or more advanced technology. abductions and experimentation on human bodies that involve these technologies, or the use of these technologies against human beings and the use of unknown "powers", are a type of fear that's different from that of other types of monsters.
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