A great many bones have been found in the caves.
Most of the marrow bones were split.
Animals do not know how to split bones, so we know that they must have been split by men.
These bones have been taken to great museums, where wise men have studied them carefully.
The wise men have learned to read their story.
The bones tell that the Cave-men ate animal food.
They tell what animals lived at that time.
They tell that people were living then, too.
Perhaps you have seen fossil plants in rocks.