What is explanatory gap? How does it relate to qualia ?
Explanatory gap is the inability to know what an experience feels like even after knowing all the physical properties that make up that experience.

An example of this is the Mary's room experiment. The experiment describes Mary, a scientist who exists in a black and white world where she has extensive access to physical descriptions of color, but no actual perceptual experience of color. The thought experiment asks whether Mary will gain new knowledge when she experiences seeing color. If explanatory gap is true then she would gain new knowledge from that experience despite knowing all physical descriptions of color.

This relates to qualia, individual instances of subjective experience, because explanatory gap states that you cannot know that such a subjective experience feels like if you do not experience it yourself.
Can you list scientists who are sceptical/against the idea of qualia and explanatory gap?