I have been to this place already 3 times and I never get bored, it is really a cool place where nothing is boaring, when we think about museum a boaring picture comes in our mind but this museum us vice versa it is divided into different floors and every floor teach us something different like on is based on biology, other is based on fun science, dinosaurs, physics, there is 3D movie also inside it and seminars goes on all the time, the ticket is affordable and it is near to pragati maidan metro stand.
This place is so big if you will look over each and every thing it will take whole day to roam only here.
I suggest you to at least once visit National science centre Delhi