They don't replace handbooks - they support handbooks because they can do things that handbooks can't do.They don't replace handbooks - they support handbooks because they can do things that handbooks can't do.They:
(1) are interactive; you get immediate feedback.
(2) can show objects in 3D by rotating them on the screen.
(3) are dynamic; you see things happening right in front of you.
(4) make use of virtual objects with which you can do experiments and teachers and parents can do demonstrations.
There is no age restriction - the younger, the better.There is no age restriction - the younger, the better.