It has been 2 years since I visited science city but still those memories are in my mind. It is one of the best attractions to see in Kolkata, visiting charge is normal, and yes there are lots to watch.
Best part in science city is the cable car ride, 3-D theater and of course the fountain show, but one cannot miss all those experiments which u will get to see there.
It has an aquarium with thousands of different types of fish , gallery, crazy demonstrations etc.
This is my suggestion to every student please go, watch, and try to learn more from it.