2　People Who Lived in Caves

How do you suppose I know about all these things that took place so long ago?I don't. I'm only guessing about them.

But there are different kinds of guesses. If I hold out my two closed hands and ask you to guess which one has the penny in it,that is one kind of a guess.Your guess might be right or it might be wrong.It would be just luck.

But there is another kind of guess. When there is snow on the ground and I see tracks of a boot in the snow,I guess that a person must have passed by,for boots don't usually walk without someone in them.That kind of guess is not just luck but common sense.

So we can guess about a great many things that have taken place long ago,even though there was no one there at the time to see them or tell about them.

We have dug down deep under the ground in different parts of the world and have found there—what do you suppose?

I don't believe you would ever guess.

We have found the heads of arrows and spears and hatchets.

The peculiar thing about these arrows and spears and hatchets is that they are not made