Your kids are amazing especially compared with everybody else's (who seem to cry all the time). How do you show your love for your kids this holiday season? With toys that are smooth and colorful, interactive and exciting. And with ones that have educational value because you are the boss.

1). FLAX ART HOSPITAL PUZZLE AND PLAY SET

    Here is a toy that doesn't need power and the kids have to put it together themselves. This 50-piece puzzle set that can make your children active is made of soft-edged hardwood and make a complete hospital, with an X ray room. It also includes eight patients, a car and a driver. $ 135; flaxart.com.

2). TINY LOVE ACTIVITY BALL

    Sure, it's cool, but this colorful baby toy also develops problem solving and motor skills. It has a head and legs, a magnetic(磁性的) hand and a tail. Suitable for little ones from 6 to 36 months. $19.95; tinylove.com.

3). ROBOSAPIEN

    This small, remote control robot is really powerful. It performs 67 preprogrammed functions(功能), including throwing, kicking, picking up and dancing. You can even program your own function ——which, sadly, does not include doing windows. $99;  robosapienonline.com.

4). MINI PEDAL（脚踏板的）CAR

    Want a Mini Cooper but can't fit the family inside? Get one for the kids. They can jump into this Mini car, which comes in hot orange with a single adjustable(可调的) seat, and ride away. For ages 3 to 5. $189; miniusa.com (click on "gear up," then "Mini motoring gear").

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    Disposing (处理) of waste has been a problem since humans started producing it. As more and more people choose to live close together in cities，the waste disposal problem becomes increasingly difficult.

    During the eighteenth century，it was usual for several neighboring towns to get together to select a faraway spot as a dump site. People would transport household rubbish，rotted wood and old possessions to the site. Regularly some of the trash was burned and the rest was buried. The unpleasant sights and smells caused no problem because nobody lived close by. Factories and some other industrial sites also had waste to be disposed of. Those located on rivers often just poured the unwanted remains into the water. Others built huge burners with chimneys to deal with the problem.

    Several facts make these choices unacceptable to modern society. The first problem is space. Dumps(垃圾场)， are most needed in heavily populated areas. Such areas rarely have empty land suitable. Farm areas are refusing to accept rubbish from elsewhere，cheap land in major city areas to dispose wastes is nonexistent(不存在的). Awareness of pollution dangers has resulted in more strict rules of waste disposal. Pollution of rivers，ground water，land and air is a price people can no longer pay to get rid of waste. The amount of waste，however， continues to grow.

    Recycling efforts have become commonplace，and many towns require their people to take part. Even the most efficient recycling programs，however，can hope to deal with only about 50 percent of a city's reusable waste，so more people should be involved in recycling programs.

    The Hawaii Volcanoes National Park

The Hawaii Volcanoes National Park, on the island of Hawaii, has two active volcanoes: Mauna Loa, which last erupted (喷发) in 1984, is 13,677 feet (4.17 km) above sea level; Kilauea is next to Mauna Loa and it has been erupting since January 3rd, 1983. It is 4,190 feet (1.23 km) above sea level.

When to visit

    The park is open 24 hours a day all year round. There are no plants or trees on the lava (火山岩) fields and no protection from the sun, so you must bring sunscreen (防晒霜).

    How to get there

    The best way to get to the park is to take Highway 11. From the airport at Hilo, Highway 11 will take you southward across the eastern part of the island.

    Things to see

    If you want to know more about the park, the Kilauea Visitor Center is surely a stop to make. It is a quarter of a mile (402 m) from the park entrance. There, you can see a great movie about real lava and learn about the island's natural and cultural history. The center is open from 7:45 a.m. to 5:00 p.m. There are also many guided walks and hikes around the park. You must check weather conditions and volcanic activity before hiking alone. If possible, you may drive down Chain of Craters Road to see lava flowing into the ocean.

    Tickets

    Entrance to the park is $10.00 for each vehicle, $5.00 for those who travel on foot or ride a bicycle. Children under the age of 15 are free.

    Every time your fingers touch your cell phone, they leave behind trace of amounts of chemicals. And each chemical offers clues to you and your activities. By studying them, scientists might be able to piece together a story about your recent life, a new study finds.

    A molecule (分子) is a group of atoms. It is the smallest amounts of some chemicals. Your skin is covered in molecules picked up by everything you touched. With each new thing your skin contacts, you leave behind some small share of what it'd touched earlier.

    Researchers at the University of California, San Diego (UCSD) recently studied such chemical leftovers on the phones of 39 volunteers. The study was led by biochemist Amina Bouslimani. To explore those residues (剩余物), the UCSD team wiped the surface of each volunteer's phone with a cotton swab (药签). The scientists also swabbed each person's right hand. Then the researchers compared the chemicals found on each cell phone.

    The scientists discovered as many of the molecules as they could. They then compared those to a database of chemicals. Pieter Dorrestein, a UCSD pharmaceutical chemist, had helped set up that database a few years earlier, which contains various substances, including spices, caffeine and medicines.

    Traces of everything from hundreds to thousands of different molecules turned up on each phone. The molecules suggested what had been in the body, and what each person had handled before touching the phone. From all these molecules, Bouslimani says, “We could tell if a person is likely female, uses high-end cosmetics (化妆品), colors her hair, drinks coffee, prefers beer over wine or likes spicy food.”

    Police already use molecular analyses to look for traces of explosives or illegal drugs. To date, Dorrestein says, he's never heard of police using phone residues to narrow down behaviour clues to search for a suspect. But detectives might one day use such data to track down someone who left a phone behind at a crime scene.

    Living abroad to study can certainly be an interesting experience but is that alone a good enough reason for spending years far away from home? To make the experience truly worthwhile, there has to be a goal behind the decision to study abroad. This may be a wish to perfect language skills in a foreign language environment, or a clever move in your career development. You must also consider the costs, not just of living and studying abroad, but of applying. Most universities now charge application fees for international students.

    If after considering these points you are sure that you want to apply to study abroad, your next step is to choose the right programme of studies. Research your choices and select carefully. You must do your homework well. Most universities have information online but you can also email and ask them to send you more details. You can find a lot of information on school ranking from education websites. But read carefully. Different universities emphasize different strengths. Don't just think about the university's reputation; look for the most suitable for your goals.

    Next, you must deal with a large pile of paperwork. This involves filling in application forms, preparing your school records, and getting reference letters. Reading the instructions and requirements of the universities carefully is of great importance. Sadly, many fine applicants get kicked out in the first round, simply because they don't follow the application procedure properly.

    Money is another important consideration. Some scholarships are provided by governments, others by schools and colleges. This information, again, can be found on the Internet. If you find a scholarship that is suitable for you, follow the application procedure carefully; the earlier you apply, the better your chance of getting it.

Robots have long been drawing inspiration from animals, with the creation of robot dogs or snake-shaped robots. And yet, the field of robotics is far less enthusiastic about the other kind of living things—plants. Barbara Mazzolai, an Italian roboticist owes this to a misconception about plant behavior: that they cannot move or think. "It's not true at all," she says. To challenge this view, Dr Mazzolai and her team recently launched a machine called "FiloBot", a robot based on a climbing species.

To survive, a climbing plant must switch between several different behaviors. In forest environments, it must first grow out of the soil and travel along the ground in search of a support to hold onto, such as a nearby tree. Once a support is located, though, the plant fixes itself around the object and then growing towards the light. To choose the best angle to grow upwards, a climbing plant uses its shoots(芽) to receive information about light and gravity.

FiloBot has sensors on its main shoot. It can 3D-print its body with plastic and grow at a controllable rate. These functions researchers found, enabled FiloBot to cross gaps, and find things to attach to. The lack of heavy on-board computing device means that it is light and requires minimal care, while its slow pace means that it doesn't disturb things around it, making it possible to move through a complex, unseen environment, or monitoring disaster sites.

For now, FiloBot is still being tested. Its tendrils(卷须) have not left the laboratory. Still, it has already been employed in deconstructing plant behaviour. For example, it was long assumed that climbing plants find their supports by growing towards shade, though the exact mechanism was unclear. FiloBot could imitate this behaviour by detecting far-red light, which is typical of shaded areas, providing clues to how plants do it.

Dr Mazzolai hopes that such projects will inspire other roboticists to take their cues from plants and develop completely new technologies.