The future is time that is to come. The future is not the present or the past. It is later. We have seen many possible futures in science fiction. They range from the world's polar ice caps melting to nuclear winters. But not all futures are morbid. We have seen the human race spread all over our universe, humans and aliens living in harmony together all over the universe.

    It is very likely that we will make some kind of breakthrough in our ability to travel through space sometime in the next 150 years. This would give us the ability to rule other planets.

    Finally, the Earth will die whether it is in 1,000 years or 100,000 years. We will be forced to move to another planet then. It's really just a matter of time. When we do so, what will we discover?

    Personally, I think everyone will be speaking the same language in 200 years. A world government definitely seems to be in our future. It is stable and has few wars. Indeed, the only type of wars that can happen is the civil war.

    And what if we face aliens? If they are friendly, we would probably benefit a lot from putting our knowledge together. They must have advanced technology to travel for great distances. We could benefit from their technology. But if they aren't friendly, then we will be in trouble. Hope that we will have become advanced enough, smart enough, and generally a better race by the time we meet them. But this is all probably being discussed for nothing, because any race out there among the stars is probably as curious as we are about other creatures.

    A scientist once said: "I have concluded that the earth is being visited by intelligently controlled vehicles from outer space."

    If we take this as a reasonable explanation for UFOs (unidentified flying objects), questions immediately come up.

    "Why don't they get in touch with us, then? Why don't they land right on the White House lawn and declare themselves?" people asked.

In reply, scientists say that, while this may be what we want, it may not necessarily be what they want.

    "The most likely explanation, it seems to me," said Dr. Mead, "is that they are simply watching what we are up to—that responsible society outside our solar system is keeping an eye on us to see that we don't cause a chain reaction that might have unexpected effects for the outside of our solar system."

    Opinions from other scientists might go like this: "Why should they want to get in touch with us? We may feel we're more important than we really are! They may want to observe us only and not interfere(干涉) with the development of our civilization. They may not care if we see them but they also may not care to say 'hello'."

    Some scientists have also suggested that Earth is a kind of zoo or wildlife reserve. Just as we set aside wilderness areas and wildlife reserves to allow animals and growing things to develop naturally while we observe them. So perhaps Earth was set aside ages ago for the same purpose.

    Are we being observed by intelligent beings from other civilizations in the universe? Are they watching our progress in space travel? Do we live in a huge "zoo" observed by our "keepers," but having no communication with them?

    Never before in our history have we had to face ideas bravely like these. The simple fact is that we, who have always regarded ourselves as supreme in the universe, may not be so. Now we have to recognize that, among the stars in the heavens, there may very well be worlds lived by beings who are to us as we are to ants.

    Children start out as natural scientists, eager to look into the world around them. Helping them enjoy science can be easy, as there's no need for a lot of scientific terms or expensive lab equipment..

    Give them time to think. Studies over the past 30 years have shown that, after asking a question, adults typically wait only one second or less for an answer, no time for a child to think. , children can give more logical, complete and creative answers.

    Watch your language. Once you have a child involved in a science discussion, don't jump in with "That's right" or "Very good". . But in talking about science, quick praise can signal that discussion is over. Instead, keep things going by saying "That's interesting or "I have never thought of it that way before", or coming up with more questions or ideas. Never force a child to think. , as children are always thinking, without your telling them to.

    What's more, giving them freedom to think can turn a conversation into a performance. The child will try to find the answer you want, in as few words as possible, so that he will be a smaller target for your disagreement.

    . Real-life impressions of nature are far more impressive than any lesson children can learn from a book or a television program. Let children look at their fingertips through a magnifying glass (放大镜), and they'll understand why you want them to wash before dinner. Rather than saying that water evaporates (蒸发), set a pot of water to boil and let them watch the water level drop.

A．It doesn't make sense

B．Listen to their questions

C．Teach them by examples

D．You only have to share your children's curiosity

E. It began with a set of questions that lasted nearly two hours

F. When adults increase their "wait time" to three seconds or more

G. These words work well when it comes to encouraging good behavior