Questions directly questioning fundamental rules about the physics of the given universe, as applied current laws of physics.
This is the type that basically says "How come ____ happens in ___ when we know that ____."
Note, this is quite different than asking for an explanation of a technology that only exists in a sci-fi or fantasy world. This category also does not include the "Is (some explanation of something) a real phenomena? Those would fit into Real-World Speculation Questions