>>96175847 (OP)Most of the time its shit and destroys what the fantasy or mythological creature is. That terrible dragon "documentary" that tried to science them up was one of the worst things made for the Discovery or Nat Geo channels. And every pseudointellectual mudcore midwit latched onto it and spread it here despite its idiocy.
It is perfectly fine to keep a thing fantastical, magical, and/or supernatural, and in fact giving it a bit of fantasy science will actually enhance it by "grounding" the fantasy world in verisimilitude. D&D has always done this for its settings, sometimes good (3.x Draconomicon, Lords of Madness, and others) and sometimes badly (quite a bit of 1e and 2e, AD&D and not).
Like dragons being capable of flight because they have a supernatural organ near their heart that spreads elemental power throughout their body, with elemental air making them capable of flight in bodies very much not capable of Earth flight. Fire (or other) breath attacks by literally vomiting up elementally infused blood/bile. And their magic spells and supernatural powers being fueled by the large amounts of elemental energy.
One simple organ now accounts for why dragons are the way they are, and none of it is based on Earth physics or non-fantastical explanations so as to keep the fantasy.
That is how you handle "sciencing" fantasy creatures and supernatural powers, not by mudcore grounded idiocy, but keeping the fantasy by providing fantastic explanations.