Request to Khan academy for adding more subjects.

I love the teaching of Khan academy but in class nine I have seen that only physics subject is there. I request Khan academy to give all the science subjects it means that I want chemistry and biology too with all the chapters. In the physics of class 9 I have seen that only 4 to 5 chapters are present but it my book there are more chapters so I request the team to bring those content as soon as possible. Thank you