Which of the following products would travel from the farm to production to grocery store shelves the most rapidly?
blueberry jam
watermelon
pasta
cereal

Watermelons, because you can just pick them and send them to the store. All the other foods had some sort of process to become what they are, which requires time.

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.