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Again,when people are parting,they may say:“Good morning!”or “Good afternoon!”or “Good evening!”or“Good night!”to one another in place of“Good-bye!”

They are not talking about the weather but saying “May all be well with you at this time!”

You will find few people today who know that "Good-bye!" is a short way of saying "God be with you!"

But in times past, when religion had more place than it now has in education, a child could be taught this very young as part of knowledge of English.

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There was a teacher who tired to teach all this.

Her students seemed to take in what she taught them.

They said back to her all together:“When you say ‘Good morning!’to us,we say ‘Good morning!’to you.”

Next morning on her way to school, she saw one of them coming.

She said to herself,“Now I will see if he has learned that point about ‘Good morning!”’

So she said to the young man:

Good morning!

Yes, it is!

She had said “Good morning”to him with a question in her mind:“Will he say ‘Good morning!’?”

She had asked a question and he had answered it.

The teacher said to herself:

I must have seemed to be asking a question, so he gave me an answer.

Next time I will do better.

At that minute she saw another student coming.

She said to herself, "Let me try again."

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So she gave the young man a friendly smile and said,

Good morning!

Thank you very much!

“What was wrong then?”the teacher asked herself.

I must have said it as if I were giving him something.

That was why he thanked me.

Next time I must keep that out of my voice.

She saw a third student coming.

This time she wanted the answer “Good morning!”so much that her voice became hard and sharp.

Good morning!

Please!

You see how little one person may know what is in another's mind even when the other is trying to show him.

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When people are from very different countries with very different ways, it can be hard for them to understand one another.

Not very long ago the number of people who knew anything about people in other countries was very small.

Few people went far from home or took much interest in other countries.

Today all this is changed.

Every day, we hear more and more about other countries and about how bad their governments are.

They hear about the strange and wrong ideas other countries have of them.

If we knew them better, we would see that people everywhere are very much like ourselves:

not very good or very bad, but in between and able to become better or worse than they are.

Our minds are as like one another as our bodies are.

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We say:“The earth is getting smaller.”

It is the same size as it was, but we can go about more and more easily.

Many more people travel outside their own countries every year.

We can get news today from any part of the world in a few seconds, that we may not always understand it.

Many more ideas, right or wrong, about other countries are in people's minds.

Most of this interest in other nations and places is good if it goes deep enough.

We need to know more.

If we can keep our heads on our shoulders, the wider knowledge and experience which are coming will help the world to better days.

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The earth seems to be getting smaller became our experience is getting wider.

All sorts of new ways of living and new ways of doing things have come to us in the last fifty years.

Stranger things are coming.

People can travel today through space to the moon, though only a very small number of them have done so.

The price is too high for most countries to send even one person there for the present.

What is Space?

That is hard to say.

It is equally hard to say what Time is.

We and the sun and the moon and the stars are all in Space and Time.

But no one understands what Space and Time are.

Not even the best philosophers are clear about them.

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These two men know that they have a space between them without being able to say what Space is.

There is not enough space in this car for all these travelers.

They know that this is so, though they cannot say what Space is.

There is more space free on this Page： than on some other Page：s of the book which take longer to read.

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It is equally hard to say what Time is.

This man has time on his hands.

This other man has not enough time for his reading.

This same amount of time seem very short to one person and very long to another.

A person's sense of time changes as their feelings change.

Some days go by much more quickly than others.

Some hours seem as if they would never end.

Some are past before they seem to have begun.

Most people find that time goes by more quickly the older they get.

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Our ideas about Space and Time are changing.

Today we can fly round the world in twenty-four hours or less.

The earth turns round on itself in twenty-four hours.

A person in an airplane flying west at 1000 miles an hour (m.p.h.) would see the earth turning.

The sun would seem to be in the same place in the sky.

The earth would turn below the airplane.

Two hundred years ago scientists thought that the world was only about 6000 years old.

Now scientists say that it is nearer six billion years old and that humans are at least five hundred thousand years old.

But we have been able to fly only in the last one hundred years.

The invention of the airplane is an invention of the twentieth century.

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Air travel would have seemed very strange two or three thousand years ago, to men keeping their sheep on the mountainsides.

All these changes are the outcome of the great step taken in the invention of numbers.

Before men could count, how did anyone know which were his sheep and which were another man's?

He put his mark on his sheep.

He was their owner.

They were his own sheep.

He owned them.

Sometimes he gave his sheep names,and them he would go through all the names-with his sheep-to see if they were all there.