Counting the number of miles traveled done by a product is a strange way of trying to tell the true situation of the environmental damage due to industry. Most food is transported around the world on container ships that are extremely energy efficient. It should be noticed that a ton of butter transported 25 miles in a truck to a farmers' market doesn't necessarily use less fuel on its journey than a similar product transported hundreds of miles by sea. Besides, the idea of “food miles” ignores the amount of fuel used in the production. It is possible to cut down your food miles by buying tomatoes grown in Britain rather than those grown in Ghana. The difference is that the British ones will have been raised in heated greenhouse and the Ghanaian ones in the open sun.

    What is the idea of “food miles” doesprovide, however, is the chance to cut out Third World countries from First World food markets. The number of miles traveled by our food should, as I see it, be regarded as a sign of the success of the global trade system, not a sign of damage to the environment.

    However wealthy we may be, we can never find enough hours in the day to do everything we want. Economics deals with this problem through the concept of opportunity cost, which simply refers to whether someone's time or money could be better spent on something else.

    Every hour of our time has a value. For every hour we work at one job we could quite easily be doing another, or be sleeping or watching a film. Each of these options has a different opportunity cost—namely, what they cost us in missed opportunities.

    Say you intend to watch a football match but the tickets are expensive and it will take you a couple of hours to get to and from the stadium. Why not, you might reason, watch the game from home and use the leftover money and time to have dinner with friends? This—the alternative use of your cash and time—is the opportunity cost.

    For economists, every decision is made by knowledge of what one must forgo—in terms of money and enjoyment—in order to take it up. By knowing precisely what you are receiving and what you are missing out on, you ought to be able to make better-informed, more reasonable decisions. Consider that most famous economic rule of all: there's no such thing as a free lunch. Even if someone offers to take you out to lunch for free, the time you will spend in the restaurant still costs you something in terms of forgone opportunities.

    Some people find the idea of opportunity cost extremely discouraging: imagine spending your entire life calculating whether your time would be better spent elsewhere doing something more profitable or enjoyable. Yet, in a sense it's human nature to do precisely that—we assess the advantages and disadvantages of decisions all the time.

    In the business world, a popular phrase is “value for money.” People want their cash to go as far as possible. However, another is fast obtaining an advantage: “value for time.” The biggest restriction on our resources is the number of hours we can devote to something, so we look to maximize the return we get on our investment of time. By reading this passage you are giving over a bit of your time which could be spent doing other activities, such as sleeping and eating. In return, however, this passage will help you to think like an economist, closely considering the opportunity cost of each of your decisions.

HEARST CASTLE, CA

    Hearst Castle is open for tours daily, except Thanksgiving, Christmas and New Year's Day.

Tour A — The Grand Rooms

    View the ground floor rooms of La Casa Grande where Mr. Hearst's guests met their host and were entertained during their stay. See the Assembly Room, where guests met for cocktails, the Refectory, where meals were served, the Morning Room, Billiard Theater. Your knowledgeable guide will bring this big house to life sharing stories about Mr. Hearst, his many guests, and the art collection it contains.

Prices: Adults: $25.00; Children: $12.00.

Tour B—The Upstairs Suites (套房)

    This tour features rooms on the upper floors of Casa Grande. Travel through guest suites on your way to the Library where Mr. Hearst housed a collection of 2,000-year-old Greek pots. Visit Mr. Hearst's private third floor suite including his bedroom and private study where he held business meetings. Learn about the genius of architect Julia Morgan and the way she put Mr. Hearst's art collection into the design.

Prices: Adults: $20.00; Children: $10.00.

Tour C—Evening Tour

    This tour allows visitors to experience the Castle at night as a visitor to the Castle in the 1930s might have. It features highlights from the experience, Upper Floors of Casa Grande, and Garden tours.

Evening tours are offered on most Fridays and Saturdays during March—May & October — December.

Prices: Adults: $36.00; Children: $18.00.

Tour D—Accessible Holiday Twilight

    This tour is wheelchair accessible. Visitors who have difficulty climbing stairs, or who cannot stand or walk for extended period, may also benefit from this tour. Accessible transportation is provided from the Visitor Center to all areas of the Holiday at Hearst Castle tour. Call 866-712-2286 for additional information.

Prices: Adults: $30.00; Children: $15.00.

    Why do I volunteer with Big Brothers Big Sisters of America? I have many reasons. Perhaps the biggest reason is that someone volunteered to help me. Years ago, I was on the other side of the table. I was lonely and felt kind of lost. More than once, I found myself on the wrong side of a jail cell(牢房). If someone hadn't stepped in, I probably wouldn't even be here right now.

    I've seen the work that Big Brothers Big Sisters has been doing all over the country and I'm pleased to be part of it. I've never done anything that made me prouder than my volunteering work. Big Brothers Big Sisters helped me get my head on straight. There are no words to describe the joy I get from helping somebody turn their life around.

    Don't tell anyone I said that, but volunteering is probably the fastest way to get over sadness or depression. Every time I start to feel bad, I talk to someone who needs my help and it makes me feel better and worse all at the same time. I feel better, because doing good things fills me with a sense of pride. I feel worse because I feel I have no right to complain about my situation especially when I hear what others are going through.

    I've come a long way from where I was. Volunteering is how I want to leave my mark on the world. I recommend volunteering work to everybody, especially for somebody who isn't sure where they're going in life. Helping someone find their path is often the best way to find yours.

    Sometimes just when we need the power of miracles to change our beliefs, they materialize in the places we'd least expect. They can come to us as a great change in our physical reality or as a simple coincidence in our lives. Sometimes they're big and can't be missed. Other times they're so subtle that if we aren't aware, we may miss them altogether. They can come from the lips of a stranger we suddenly and mysteriously meet at just the right instant. If we listen carefully, we'll always hear the right words, at the right time, to dazzle (目眩) us into a realization of something that we may have failed to notice only moments before.

    On a cold January afternoon in 1989, I was hiking up the trail that leads to the top of Egypt's Mt. Horeb. I'd spent the day at St. Catherine's Monastery and wanted to get to the peak by sunset to see the valley below. As I was winding up the narrow path, I'd occasionally see other hikers who were coming down from a day on the mountain. While they would generally pass with simply a nod or a greeting in another language, there was one man that day who did neither.

    I saw him coming from the last switchback on the trail that led to the backside of the mountain. As he got closer, I could see that he was dressed differently from the other hikers I'd seen. Rather than the high-tech fabrics and styles that had been the norm, this man was wearing traditional Egyptian clothing. He wore a tattered, rust-colored galabia and obviously old and thick-soled sandals that were covered in dust. What made his appearance so odd, though, was that the man didn't even appear to be Egyptian! He was a small-framed Asian man, had very little hair, and was wearing round, wire-rimmed glasses.

    As we neared one another, I was the first to speak, "Hello," I said, stopping on the trail for a moment to catch my breath. Not a sound came from the man as he walked closer. I thought that maybe he hadn't heard me or the wind had carried my voice away from him in another direction. Suddenly he stopped directly in front of me on the high side of the trail, looked up from the ground, and spoke a single sentence to me in English, "Sometimes you don't know what you have lost until you've lost it." As I took in what I had just heard, he simply stepped around me and continued his going down the trail.

    That moment in my life was a small miracle. The reason is less about what the man said and more about the timing and the context. The year was 1989, and the Cold War was drawing to a close. what the man on the trail couldn't have known is that it was during my Egyptian pilgrimage (朝圣), and specifically during my hike to the top of Moses's mountain, that I'd set the time aside to make decisions that would affect my career in the defense industry, my friends, my family, and, ultimately, my life.

    I had to ask myself what the chances were of an Asian man dressed in an Egyptian galabia coming down from the top of this historic mountain just when I was walking up, stopping before me, and offering his wisdom, seemingly from out of nowhere. My answer to my own question was easy: the odds were slim to none! In a meet that lasted less than two minutes on a mountain halfway around the world from my home, a total stranger had brought clarity and the hint of a warning, regarding the huge changes that I would make within a matter of days. In my way of thinking, that's a miracle.

    I suspect that we all experience small miracles in our lives every day. Sometimes we have the wisdom and the courage to recognize them for what they are In the moments when we don't, that's okay as well. It seems that our miracles have a way of coming back to us again and again. And each time they do, they become a little less subtle, until we can't possibly miss the message that they bring to our lives!

The key is that they're everywhere and occur every day for different reasons, in response to the different needs that we may have in the moment. Our job may be less about questioning the extraordinary things that happen in our daily lives and more about accepting the gifts they bring.

    The common cold is the world's most widespread illness, which is probably why there are more myths(神话) about it than any of the other illnesses.

    The most widespread mistake of all is that colds are caused by cold. They are not. They are caused by viruses passing on from person to person. You catch a cold by coming into contact, directly or indirectly, with someone who already has one. If cold causes colds, it would be reasonable to expect the Eskimos to suffer from them forever. But they do not. And in isolated Arctic regions explorers have reported being free from colds until coming into contact again with infected(感染的) people from the outside world by way of packages and mails dropped from airplanes.

    At the Common Cold Research Unit in England, volunteers took part in Experiments in which they gave themselves to the discomforts of being cold and wet for long stretches of time. After taking hot baths, they put on bathing suits, allowed themselves to be doused(浸入) with cold water, and then stood about dripping(滴干)wet in drafty(通风的) rooms. Some wore wet socks all day while others exercised in the rain until close to exhaustion. Not one of the volunteers came down with a cold unless a cold virus was actually dropped in his nose.

    If cold and wet have nothing to do with catching colds, why are they more frequent in the winter? In spite of the most painstaking research, no one has yet found the answer. One explanation offered by scientists is that people tend to stay together indoors more in cold weather than at other times, and this makes it easier for cold viruses to be passed on.

    No one has yet found a cure for the cold. There are drugs and pain suppressors such as aspirin, but all they do is to relieve the symptoms.