One day，Mr.Arnold was teaching a lesson，and things were going as normally as ever.He was explaining the story of mankind to his pupils.He told them that，in the beginning，men were nomads(游牧人)；they never stayed in the same place for very long.Instead，they would travel about，here and there，in search of food，wherever it was to be found. And when the food ran out，they would move off somewhere else.

He taught them about the invention of farming and keeping animals.This was an important discovery，because by learning to cultivate(耕作)the land，and care for animals，mankind would always have food steadily available.It also meant that people could remain living in one place，and this made it easier to set about tasks that would take a long while to complete，like building towns，cities，and all that were in them.All the children listening were attracted by this story，until Lucy jumped up：

    “And if that was so important and improved everything so much，why are we nomads all over again，Mr.Arnold？”

    Mr.Arnold didnt know what to say. Lucy was a very intelligent girl.He knew that she lived with her parents in a house，so she must know that her family were not nomads；so what did she mean?

“We have all become nomads again，” continued Lucy.“The other day，outside the city，they were cutting the forest down. A while ago a fisherman told me how they fish.Its the same with everyone：when theres no more forest left, the foresters go elsewhere，and when the fish run out, the fishermen move on.Thats what the nomads did，isnt it？”

The teacher nodded,thoughtfully. Really,Lucy was right. Mankind had turned into nomads. Instead of looking after the land in a way that we could be sure it would keep supplying our needs，we kept developing it until the land was bare.And then off we would go to the next place！The class spent the rest of the afternoon talking about what they could do to show how to be more civilized.

    The next day everyone attended class wearing a green T-­shirt，with a message that said，“I am not a nomad！”

    And，from then on，they set about showing that indeed they were not.Every time they knew they needed something，they made sure that they would get it using care and control.If they needed wood or paper，they would make sure that they got the recycled kind.They ordered their fish from fish farms，making sure that the fish they received were not too young and too small.They only used animals that were well cared for，and brought up on farms.

    And so，from their little town，those children managed to give up being nomads again，just as prehistoric men had done so many thousands of years ago.

    People are being lured(引诱)onto Facebook with the promise of a fun and free service without realizing they're paying for it by giving up large amounts of personal information. Facebook then attempts to make money by selling their data to advertisers that want to send targeted messages.

    Most Facebook users don't realize this is happening. Even if they know what the company is up to, they still have no idea what they're paying for Facebook, because people don't really know what their personal details are worth.

    The biggest problem, however, is that the company keeps changing the rules. Early on, you could keep everything private. That was the great thing about Facebook—you could create your own little private network. Last year, the company changed its privacy rules so that many things—your city, your photo, your friends' names—were set, by default(默认), to be shared with everyone on the Internet.

    According to Facebook's vice-- president Elliot Schrage, the company is simply making changes to improve its service, and if people don't share information, they have a “less satisfying experience.”

    Some critics think this is more about Facebook looking to make more money. Its original business model, which involved selling ads and putting them at the side of the page, totally failed. Who wants to look at ads when they're online connecting with their friends?

    The privacy issue has already landed Facebook in hot water in Washington. In April, Senator(议员) Charles Schumer called on Facebook to change its privacy policy. He also urged the Commission to set guidelines for social-networking sites. “I think the senators rightly communicated that we had not been clear about what the new products were and how people could choose to use them or not to use them,” Schrage admits.

    I suspect that whatever Facebook has done so far to invade our privacy, it's only the beginning, which is why I'm considering deactivating(撤销)my account. Facebook is a handy site, but I'm upset by the idea that my information is in the hands of people I don't know. That is too high a price to pay.

    Here we introduce some rental houses to you.

    Apartment Levant in Komiza

    Overlooking one of the most beautiful fishing villages in Croatia, our two-storey house also gives you a full view of Komiza bay as well as neighboring island of Bisevo.The apartment has a wide，covered balcony and a small garden with lemon trees. It is only 10 minutes' walk from the centre of the village, although it is on the edge of the village, with forests behind the house.

    Apartment Domina

    Located in the centre of the city, the apartment is protected as a historical site. All other facilities are at your fingertips such as restaurants, shops and museums. The apartment is fully equipped and air-conditioned, having a kitchen with a dishwasher, a satellite TV and the free Web access. It contains a bedroom with a double bed and antique furniture. Besides, the apartment offers pet-friendly accommodation.

    Apartment Tonka

    The apartment is located in an old stone house in the centre of Komiza. It offers two bedrooms, each with a separate bathroom, and a living room with a furnished kitchen. The house is only a couple of minutes away from the old harbor, along the old town's street where you can enjoy Komiza's rich cultural history. The bus stop is less than 200 meters away, near the fruit and vegetable market.

    Pearl of Issa

    This two-bedroom apartment is only a few minutes' walk from beautiful beaches, shops, restaurants, cafés and bars. It consists of two bedrooms, a fully equipped modern kitchen, a dining room and a resting area with a sofa, which can be used as an extra sleeping place for one person, a bathroom and a balcony with comfortable garden furniture and barbecue equipment.

My First Marathon

    A month before my first marathon, one of my ankles was injured and this meant not running for two weeks, leaving me only two weeks to train. Yet, I was determined to go ahead.

    I remember back to my 7th year in school. In my first P.E. class, the teacher required us to run laps and then hit a softball. I didn't do either well. He later informed me that I was “not athletic”.

    The idea that I was “not athletic” stuck with me for years. When I started running in my 30s, I realized running was a battle against myself, not about competition or whether or not I was athletic. It was all about the battle against my own body and mind. A test of wills!

    The night before my marathon, I dreamt that I couldn't even find the finish line. I woke up sweating and nervous, but ready to prove something to myself.

Shortly after crossing the start line, my shoe laces(鞋带) became untied. So I stopped to readjust. Not the start I wanted!

    At mile 3, I passed a sign: “GO FOR IT, RUNNERS!”

    By mile 17, I became out of breath and the once injured ankle hurt badly. Despite the pain, I stayed the course walking a bit and then running again.

    By mile 21, I was starving!

    As I approached mile 23, I could see my wife waving a sign. She is my biggest fan. She never minded the alarm clock sounding at 4 a.m. or questioned my expenses on running.

    I was one of the final runners to finish. But I finished! And I got a medal. In fact, I got the same medal as the one that the guy who came in first place had.

    Determined to be myself, move forward, free of shame and worldly labels(世俗标签), I can now call myself a “marathon winner”.

    Mom wanted only one thing for her birthday. "Can you find me another copy of this song?" she asked, and handed me a worn-out cassette tape. I knew exactly what was recorded on it: My Redeemer. I heard the song played at least a thousand times while growing up. After so many years, the cassette tape was too worn out to be used. I promised her I would find a replacement.

    My Redeemer became Mom's favorite song after my younger brother Tim was killed by a drunk driver in 1973. The only thing that helped her calm down was the soulful sound of My Redeemer from the local radio station. We recorded it on a cassette tape so she could listen to it any time she wanted but none of us knew who the soloist(独唱者) was. These days, I thought the song would be easy to find out. I went home and searched the Internet. Several songs with that title popped up, but none of them was the one Mom loved. I got frustrated.

    Mom's birthday drew near and then one day, I was driving home, listening to our local radio station. A familiar tune came on. It was My Redeemer!As soon as I could, I phoned the station. I got a line on the soloist, who was called Alan Parks. I typed his name into Google and found his home number in South Carolina. Minutes later, I was telling him how much his recording meant to Mom. He offered to ship two CDs out to me personally. I gave him my address. "Red Lion, Pennsylvania?"he said. "Do you know the Logans?""They are our neighbors!""I've been friends with them for 25years," Alan said. "They'll be at my concert at York Gospel Chapel on April 17th. Would you and your mom come too?" We sure would. Mom was excited to hear Alan sing My Redeemer to her, live in concert-on the evening of her 87th birthday.

    On a recent spring morning. Susan Alexander, a retired government intelligence analyst, left her Maryland home, climbed into her Volkswagen Passat and drove about three miles to pick up two strangers. She battled rush-hour traffic on the Capital Beltway and George Washington Memorial Parkway before dropping them off at Reagan National Airport. She didn't earn a cent for her trouble, and that was the point.

    Alexander is a member of the Silver Spring Time Bank— one of more than 100 such exchanges around the world trying to build community by exchanging time credits for services instead of dollars and cents. "I have time," she said. "I like giving the gift of time to other people."

    In Alexander's case, passengers Mary and Al Liepold were grateful for the ride, but it wasn't charity. Mary, a retired writer and editor for nonprofit organizations, used time credits she banked for editing work and baking. Senior citizens who don't drive, the Liepolds cashed in their credits to catch a flight to Montreal for a five-day vacation.

    Without money changing hands or shifting between virtual accounts, the airport drop-off was more like a coffee party than a taxi ride. Driver and passengers chatted about projects they've completed for the time bank, and no one raised an eyebrow when Mary said she likes "to avoid the conventional economy."

    "The beauty of this is that you make friends," Mary Liepold said. "You don't just get services."

    The Silver Spring Time Bank formed in 2015 and has about 300 members, said co-founder Mary Murphy. Last year, she said, l,000 hours were exchanged for basic home repairs, dog walking, cooking and tailoring, among other services, without the exchange of money." You get to save that money that you would have spent," she said. "You get to meet somebody else in your community and get to know that person. That's a bonus that's part of an exchange."

    A deal performed partly to make friends would seem to go against classical economics and one of Benjamin Franklin's most memorable sayings: "Time is money." To those at the forefront of modern time-banking, that is the appeal.