He found a mole in the garden.

He found out the truth and was surprised.

He is really knowledgeable and always teaches us new information.

I saw many animals at the zoo.

The short-beaked echidna, a species unique to Australia, is known for its distinctive appearance.

It's better for him not to know the truth. After all, ignorance is bliss.

He is feigning ignorance about that problem.

He knows that pain through his own experience.

I have no way of knowing what he is thinking.

He is working hard to make his abilities known to the world.