Back in 2003 an 86-year-old man drove his Buick through a crowded farmers' market. Nine people were killed. More than fifty-four people were hurt, fourteen with serious injuries. When he finally stopped, the 86-year-old man got out his car and screamed at people to get out of the way. No alcohol or drugs were found in his system. Apparently, he was just old and confused.

    This is a frightening accident, and it is not a rare one. There are many examples of elderly drivers driving into swimming pools, houses, storefronts, or worse.

    In our teenage years, we all heard “driving is not a right; it's a privilege.” That is still true, and there comes an age when driving is no longer a privilege that can be allowed. After a certain age, eyesight and dementia(痴呆) are very serious concerns. Undoubtedly, these age-related problems affect some older adults' driving ability. By the time a person is between eighty-five and ninety years old, his or her driving privilege should be examined.

    Licensing laws vary greatly from state to state, and it's time for a national law on the maximum age limit for driving. The motivation for this law is safety. Another option is to start with laws that ban anyone over the age of eighty-five from driving after sundown, because driving conditions are not as safe as daylight hours. Still another option that may allow elderly drivers to continue driving could be new technology like a voice warning system that cautions drivers on busy streets or at traffic lights. Finally, since there are laws against driving under the influence of alcohol and drugs, shouldn't some prescription drugs also be included? The average age of 85-year-old is undoubtedly taking at least one prescription drug daily.

    The thought of an 86-year-old driver with failing eyesight running down the road in a two-ton piece of metal is unsettling to us all. Driving at an advanced age is not only challenging for the elderly drivers, but also it's dangerous for the rest of us.

    It's generally believed that people act the way they do because of their personalities and attitudes.They recycle their garbage because they care about the environment.They pay $5 for a caramel brulee latte because they like expensive coffee drinks.

    It's undeniable that behavior comes from our inner dispositions（性情）,but in many instances we also draw inferences about who we are,as suggested by the social psychologist Daryl Bern,by observing our own behavior.We can be strangers to ourselves.If we knew our own minds,why would we need to guess what our preferences are from our behavior?If our minds were an open book,we would know exactly how much we care about the environment or like lattes.Actually,we often need to look to our behavior to figure out who we are.

    Moreover,we don't just use our behavior to learn about our particular types of character—we infer characters that weren't there before.Our behavior is often shaped by little pressures around us,which we fail to recognize.Maybe we recycle because our wives and neighbors would disapprove if we didn't.Maybe we buy lattes in order to impress the people around us.We should not mistakenly believe that we always behave as a result of some inner disposition.

    Whatever pressures there can be or inferences one can make,people become what they do,though it may not be in compliance（符合）with their true desires.Therefore,we should all bear in mind Kurt Vonnegut's advice:"We are what we pretend to be,so we must be careful about what we pretend to be."

Dear Anne,

    I like your column very much. I met a girl four years ago at a gym. She was the one who originally approached me and we became good friends. Then one day, she made me really angry, so angry that I just left and we never saw each other again.

    Looking back, I really regret ending things that way. It was a cowardly act on my part, but I had a terrible temper at that time and let the smallest thing get to me. Recently, I've started thinking about her again and I looked up her e-mail address. I thought about writing to say “Hi” and apologize for what I did but I'm not sure. She could still be angry with me, or maybe she has forgotten me. I feel very lonely and I want to see her again. What should I do?

Tom

Dear Tom,

    She may still be angry with you, and she may have forgotten the friendship between you, but that doesn't mean she doesn't deserve an apology. Tom, how many of us have wished for the day that someone who treated us badly saw the light and finally owned up? But we rarely get that kind of expected result. So sure, e-mail her and say “Hi”.

    Tell her you have been thinking about her and just want to apologize for getting angry and being a coward by walking out on her. But you should remember if she thinks you're apologizing just because you are lonely, she might dismiss your sincerity. Therefore, don't mention that. If she wants to see you again, she'll make sure that happens.

    Even if she doesn't want to be your friend, I can assure you, she'll appreciate the gesture. And it might make you think twice next time you get angry.

Anne

    "Have a nice day！" may be a pleasant gesture or a meaningless expression. When my friend Maxie says "Have a nice day" with a smile, I know she sincerely cares about what happens to me. I feel loved and safe since another person cares about me and wishes me well.

    "Have a nice day. Next！" This version of the expression is spoken by a salesgirl at the supermarket who is rushing me and my groceries out the door. The words come out in the same tone (腔调) with a fixed procedure. They are spoken at me, not to me. Obviously, the concern for my day and everyone else's is the management's attempt to increase business.

    The expression is one of those behaviors that help people get along with each other. Sometimes it indicates the end of a meeting. As soon as you hear it, you know the meeting is at an end. Sometimes the expression saves us when we don't know what to say. "Oh, you just had a tooth out? I'm terribly sorry, but have a nice day. "

    The expression can be pleasant. If a stranger says "Have a nice day" to you, you may find it heart­warming because someone you don't know has tried to be nice to you.

    Although the use of the expression is an insincere, meaningless social custom at times, there is nothing wrong with the sentence except that it is a little uninteresting. The salesgirl, the waitress, the teacher, and all the countless others who speak it without thinking may not really care about my day. But in a strange and comfortable way, it's nice to know they care enough to pretend they care when they really don't care all that much. While the expression may not often be sincere, it is always spoken. The point is that people say it all the time when they like.

Plastic-Eating Worms

    Humans produce more than 300 million tons of plastic every year. Almost half of that winds up in landfills(垃圾填埋场)，and up to 12 million tons pollute the oceans. So far there is no effective way to get rid of it, but a new study suggests an answer may lie in the stomachs of some hungry worms.

    Researchers in Spain and England recently found that the worms of the greater wax moth can break down polyethylene, which accounts for 40% of plastics. The team left 100 wax worms on a commercial polyethylene shopping bag for 12 hours, and the worms consumed and broke down about 92 milligrams, or almost 3% of it. To confirm that the worms' chewing alone was not responsible for the polyethylene breakdown, the researchers made some worms into paste(糊状物) and applied it to plastic films. 14 hours later the films had lost 13% of their mass--apparently broken down by enzymes(酶)from the worms' stomachs. Their findings were published in Current Biology in 2017.

    Federica Bertocchini, co-author of the study, says the worms' ability to break down their everyday food-beeswax--also allows them to break down plastic "Wax is a complex mixture, but the basic bond in polyethylene, the carbon-carbon bond, is there as well, "she explains. "The wax worm evolved a method or system to break this bond. "

    Jennifer Debruyn, a microbiologist at the University of Tennessee, who was not involved in the study, says it is not surprising that such worms can break down polyethylene. But compared with previous studies, she finds the speed of breaking down in this one exciting. The next step, DeBruyn says, will be to identify the cause of the breakdown. Is it an enzyme produced by the worm itself or by its gut microbes(肠道微生物)?

    Bertocchini agrees and hopes her team's findings might one day help employ the enzyme to break down plastics in landfills. But she expects using the chemical in some kind of industrial process-not simply "millions of worms thrown on top of the plastic."

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