My toddler never gets tired of taking plastic containers, pots and pans in and out of the kitchen cupboards and pulling books off shelves. Why is this happening and what can I do about it?

As long as it's not going to be causing him any harm, just let him explore and have fun. If you're worried that he will get hurt or simply tired of picking up after baby, you could move the items to higher ground, where it is not as easily accessible to baby. You could also try distracting baby with other more appropriate and safer items he can play with like interactive books or educational building blocks.