Here's why:

* Conductors allow electricity to flow through them easily. This is because they have free electrons that can move around.

* Insulators resist the flow of electricity. They have tightly bound electrons that cannot move freely.

Wood is a good insulator because its electrons are tightly bound within its molecular structure. This makes it difficult for electricity to flow through it.

Here are some other examples of non-conductors (insulators):

* Rubber

* Plastic

* Glass

* Air

Let me know if you'd like to explore other examples or learn more about conductivity!