In the fanfiction, perhaps Harry has a special ability or spell that helps him tell the twins apart. Or it could be as simple as the twins deliberately giving him some secret signs or signals to help him differentiate. Another possibility is that Harry notices differences in their magical auras. Each person's magical aura can be unique, and Harry, being observant, might have detected this difference between the twins.
It could be as simple as their voices. Maybe one has a slightly deeper or higher pitch than the other. Hermione, being intelligent and detail - oriented, pays close attention to these nuances and is thus able to tell them apart.
One way is to pay attention to the direction of writing. Some Asian scripts write from top to bottom, while others go from left to right. Also, the complexity and simplicity of the characters can give you hints.
It could be that Percy pays attention to their individual interests within the fanfiction. If one of them has a particular hobby or passion that the other doesn't share as strongly, that could be a clue for Percy. Also, perhaps their interactions with other characters differ slightly. Fred might be more likely to tease a certain character, while George has a different way of relating to that same character.
You can look at the art style. Chinese comics often have a more diverse range of styles, while Japanese comics usually have distinct character designs and panel layouts. Korean comics might feature more detailed and realistic art.
In some fanfics, Harry might be able to tell Fred and George apart by their different interests within the story. For example, Fred could be more interested in potion - making experiments that are a bit on the wild side, while George is more into the business side of their joke shop plans. So when they talk about their hobbies or future plans, Harry can distinguish between them. Also, their sense of humor might be slightly different. Fred might crack a certain type of joke more often, like those related to magical creatures in a really absurd way, while George prefers jokes about Hogwarts professors. Through these nuances in their personalities, Harry is able to tell them apart.
To tell fact from fiction in 'A Million Miles Away', look for evidence. If there are references to real scientific research or historical events, it's likely fact. If it seems too good to be true or goes against known science, it's probably fiction. For example, if a character can travel through time while in space in the story, that's fiction as there's no scientific proof of time travel yet.
The '5 Feet Apart' story is about two cystic fibrosis patients who have to stay at least five feet apart from each other to avoid cross - infection. It's a story of young love and the challenges they face while dealing with their illness. They want to be close but their medical condition restricts them.