When milk arrived on the doorstep

    When I was a boy growing up in New Jersey in the 1960s, we had a milkman delivering milk to our doorstep. His name was Mr.Basille. He wore a white cap and drove a white truck. As a 5-year-old boy, I couldn't take my eyes off the coin changer fixed to his belt. He noticed this one day during a delivery and gave me a quarter out of his coin changer.

    Of course, he delivered more than milk. There was cheese, eggs and so on. If we needed to change our order, my mother would pen a note-"Please add a bottle of buttermilk next delivery"—and place it in the box along with the empty bottles. And then, the buttermilk would magically appear.

    All of this was about more than convenience. There existed a close relationship between families and their milkmen. Mr. Basille even had a key to our house, for those times when it was so cold outside that we put the box indoors, so that the milk wouldn't freeze. And I remember Mr. Basille from time to time taking a break at our kitchen table, having a cup of tea and telling stories about his delivery.

    There is sadly no home milk delivery today. Big companies allowed the production of cheaper milk thus making it difficult for milkmen to compete. Besides, milk is for sale everywhere, and it may just not have been practiced to have a delivery service.

    Recently, an old milk box in the countryside I saw brought back my childhood memories. I took it home and planted it on the back porch. Every so often my son's friends will ask what it is. So I start telling stories of my boyhood, and of the milkman who brought us friendship along with his milk.

    Luciano Baietti, a retired school headmaster from Italy, holds the Guinness record for the most university degrees. The 70­year­old currently has 15 bachelors(学士) or masters degrees from various universities across Italy, and is getting ready to get his 16th.

    Getting more than one college degree is not exactly unheard­of, but 15 is apparently quite impressive, since it's only been done by one man. Although he spends his days working around his house and garden, like most people his age, at night, Baietti turns into a student again. Every morning, at 3 a. m．， he wakes up and studies by the light of his desk lamp.

    “Thanks to books, I feel free. After all, the words share the same root，” he says, referring to the Italian words libro(book) and libero(free). He is inspired by the 19th century French essayist Louis­Francois Berlin, whose portrait(肖像)is also on display in his study, alongside his many framed university degrees, and whom he describes as “a man of culture and knowledge”．

    Baietti first made it into the Guinness Book of Records in 2002, after his eighth degree. Then he spent the next 15 years adding seven more bachelors and masters degrees to his collection.

    “Each time I set myself a new challenge to see how far my body and my brain can go.” At 70 years old, Baietti thinks he has enough energy for at least one more degree, this time in food science.

    Probably the most important thing about Baietti's achievement is that he managed to get most of his university degrees while working as headmaster of a secondary school, and volunteering with Italy's Red Cross. The secret was always getting up at 3 in the morning to make sure that his thirst for knowledge didn't affect his professional activity and his family life. He spent 3 hours studying every day, and that was apparently all he needed to pass his exams and write his theses (论文)．

    In an effort to avoid a coming storm, Ronnie Stewart and Krystal Stewart were running to their car in the parking lot of Refuge Church when they noticed two young homeless boys with their parents on the sidewalk. The Stewarts approached the boys' parents asking to take them home for a night for a bath and warm bed. They didn't know what their response would be, but as it turned out, they were thrilled.

    The Stewarts took the two boys, who are 1 and 2 years old, home, where they slept for over a straight 10 hours.,

    “I don't think they've ever slept in a bed before,” Krystal said.

    The next day, the Stewarts gave the parents their phone numbers and told them to call if they ever wanted the boys to have a warm bed.

    It wasn't long before the Stewarts headed to pick the boys up after receiving a call from their parents at midnight.

    They brought them back the next morning and a few hours later, they were greeted by the Department of Social Services and police officers, who had been discussing living arrangements for the boys with their parents.

    “They asked if we could take them, in. Next, thing I knew, the boys were in my backseat with my kids on their way home with us. They may not have known at that time, but our three kids were already calling the two young boys their brothers,” Krystal said.

    A few days later, the Stewarts sat down with two social workers and the boys' parents. They had many choices to choose from, but felt strongly about wanting the boys to join the Stewarts' family.

    The agreement has been signed and adoption procedure（程序）should be finished before long.

    Getting around in Canada is fairly easy. Most cities have urban transportation systems, including buses, streetcars, and trains, and some of the larger cities also have subways.

    You can board the transportation at regular stops along the routes. Some let you pay in cash, others require tickets. If you don't have a ticket for the bus, you must pay the right amount of money. This is because the driver does not carry any change. Once you get settled, you may want to buy a monthly pass or a package of tickets to save money. You can buy subway tickets at the subway station.

    If you have to take several buses or change subways on a single trip, you do not need to pay money each time. Simply ask the driver for a transfer, or pick one up from the machine on the subway platform.

    If you are not sure where to board the bus or the streetcar, just ask someone, or follow the crowd. It's usually at the front of the bus, where you show your pass to the driver. When using public transportation, Canadians line up. First come, first served, is a common approach to many activities in Canada.

    Maps of routes and schedules are usually available from the public transit company in your area, and there may also be a telephone information line. You may want to ask someone for the name of the transit company in the area where you live, and then look it up in your telephone book.

    College students may find a greener campus when they return to classes this fall. Some schools arc repairing older buildings and constructing new ones that arc better for the environment. Other steps include adding wind and solar energy systems and planting vegetable gardens.

    George Washington University（GW）is a private school with 200.000 students. The university has two gardens where students volunteer their time.

    Over the last ten years GW has developed projects in three main areas-climate, water and eco-systems. They have begun to create projects on the ground to address climate change, They are planning on becoming carbon-neutral（平衡的）and, in fact, reducing the footprint by forty percent by 2025, from creating solar hot-water systems on our rooftops to making our buildings much more energy efficient. The school also offers 140 different classes in sustainability （可持续性发展）and the environment.

    Mark Orlouski said. "We see numbers like less than 20% of school having a green building policy five years ago, and now upwards of 80% of schools having a policy, which states that their new buildings will be built in a green fashion.

    GW is located in the Foggy Bottom neighborhood of Washington. Some neighbors say that while GW is laying to be Friendlier to the environment, it could also be a better friend to the neighborhood. The school has expanded quickly and there have been tensions between students and local residents

Steager is an engineer at the University of Pennsylvania. His colleague Hyun Koo is an inventor and dental researcher there. Together, they found a way to form the nanoparticles（纳米颗粒）into long, skinny bristles（鬃毛）, a lot like the ones on a toothbrush. But these bristles shape-shift to fit whatever surface they encounter. They can even squeeze between teeth.

"A new way to clean teeth could help out anyone who finds this chore boring," says Koo. But it would be especially life-changing for people with disabilities or illnesses that make it difficult or impossible to hold and move a toothbrush.

The tooth-cleaning robot works thanks to two magnets（磁铁）. One goes on each side of the teeth. The nanoparticles sit in a water-based solution between the magnets. When the magnets are turned off, the nanoparticles float randomly in the solution. As soon as one magnet gets turned on, the nanoparticles clump together near its center. When you turn on the other magnet and turn off the first one, the nanoparticles extend outward in long, skinny bristles.

When there's a tooth in the way, these bristles can't stretch out as far as they want. So they push against the tooth's surface. If there's a gap between teeth, they push into the gap. Moving the magnets makes the bristles move against and between teeth.

Besides, as a bonus, the nanoparticles can kill what harms the teeth and keep them health y because it contains something commonly added to toothpaste and mouthwash.

The new invention is just a proof of concept. The researchers still need to turn it into a product that people will want to use. It must fit comfortably and safely in people's mouths. It can't draw too much power or cost too much. "There's a lot of engineering to get from here to there," says Steager. But he adds, "every good idea needs to have a start."