Recently, I was talking with a friend of mine about a mutual(共同的) friend of ours. “I wish I could be like Jenny. She always seems so happy. I’m not joking; I honestly think she has the perfect life,” said my friend.

If you were to look at the Instagram account of Jenny, you would indeed see what looks like the perfect life. However, despite the enviable content of her Instagram, I learned through a conversation with this girl that it was all carefully handled. Everything was put together to maintain the public image that she was a happy-go-lucky and carefree girl. When she was sad or upset, there was no indication of these emotions on her Instagram.

In fact, we all choose our online media presence. Look through your Instagram — I bet that you don’t post pictures where you don’t feel camera-ready. On Instagram, we always show our “good side”. Think about it. Would you rather post “I tried so hard but I ended up failing my test” or “ I treated myself to a hot coffee after studying hard all week”?

We all want to present the best parts of our lives, to show what’s going well and what we’re proud of. We take photos of the nice things we own, or of any sorts of events considered “special”, such as invite-only or formal parties. We post photos of the good times rather than the bad times. No matter what happens, we try to make our online image perfect.

There’s absolutely nothing wrong with making your online presence perfect — everyone does it in some way or another. However, when it comes to feeling envious of someone else’s Instagram posts, remember that just like you, they’re showing their good side.

Some futurologists have assumed that the vast increase of women in the workforce may portend（预示）an increase in divorce. The opposite of this concern is that the outlook of becoming a multi-paycheck household could encourage marriage. The earning ability of a woman can make her more attractive as a marriage partner.

The increase in divorce rates follows to the increase in women working outside the home. Yet, it may be wrong to jump to any simple cause-and-effect conclusions. The effect of a wife’s work on divorce is no less cloudy than its effect on marriage decisions. The realization that she can be a good provider may increase the chances that a working wife will choose divorce over an unsatisfactory marriage. But the reverse is equally reasonable. Tensions grounded in financial problems often play a key role in ending a marriage. By raising a family’s standard of living, a working wife may strengthen her family’s financial and emotional stability.

Psychological factors also should be considered. For example, a wife blocked from a career outside the home may feel caged in the house. She may view her only choice as seeking a divorce. On the other hand, if she can find fulfillment through work outside the home, work and marriage can go together to create a stronger and more stable union.

A working wife may rob a husband of being the master of the house. Meanwhile, an attractive woman who finds her value in work may play an important role in a stable marriage. Depending upon how the couple reacts to these new conditions, it could create a stronger equal partnership or it could create new insecurities.

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The twentieth century saw greater changes than any century before. Changes for the better, changes for the worse, changes that brought a lot of benefits to human beings, changes that put man in danger. Many things caused the changes, but, in my opinion, the most important was the progress in science.

Scientific research in physics and biology has vastly broadened our views. It has given us a deeper knowledge of the structure of matter and of the universe. It has brought us a better understanding of the nature of life and of its continuous development. Technology in the application of science has made big advances that have benefited us in nearly every part of life.

The continuation of such activities in the twenty-first century will result in even greater advantages to human beings; in pure science -a wider and deeper knowledge in all fields of learning; in applied science -a more reasonable sharing of material benefits, and better protection of the environment.

Sadly, however, there is another side to the picture. The creativity of science has been employed in doing damage to mankind. The application of science and technology to the development and production of weapons of mass destruction has created a real danger to the continued existence of the human race on this planet. We have seen this happen in the case of nuclear weapons. Although their actual use has so far occurred only in the Second World War, the number of nuclear weapons that were produced and made ready for use was so large that if the weapons had actually been used, the result could have been the ruin of the human race, as well as of many kinds of animals.

William Shakespeare said, ''The web of our life is of a mingled yarn, good and ill together. ''The above brief review of the application of only one part of human activities-science -seems to prove what Shakespeare said. But does it have to be so? Must the ill always go together with the good? Are we biologically programmed for war?