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.

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 is made of soft-edged hardwood and makes a complete hospital, with an X-ray room. It also includes eight patients, a car and a driver. $135.

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(磁铁) hand and a tail. Suitable for little ones from 6-36 months. $19.95; tiny-love.com.

ROBOSAPIEN

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

MINI PEDAL 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 seat, and ride away. But it could spoil them for that used car they'll be driving when they turn 16. For ages 3 to 5. $189; minicar.com (click on “gear up” then “mini motoring gear”)

    The discussion on renewable energy has been going on for at least a decade and people have relied on fossil fuels almost entirely for more than a century. However, the situation when fossil fuels were the most efficient and the cheapest source of energy has been left far in the past. Many countries such as Germany and Sweden have already made significant efforts to fix this situation, employing numerous power plants working on the renewable resources of energy. The most effective among these resources is geothermal（地热的）energy.

    Geothermal energy does not depend on the world's economic and political situation as strongly as fossil fuels do. Besides, extracting（提炼）fossil fuels adds to the price of energy produced from them. Therefore, geothermal energy is much cheaper than traditional ones, saving up to 80% of the costs over fossil fuels.

    Being a renewable resource, geothermal energy produces less waste and pollution than traditional energy sources. In geothermal systems, carbon dioxide makes up about 10% of air produced. Overall, in order to produce the electricity that can be used for one hour, the geothermal systems produce 0.1 pound of carbon dioxide and other harmful gases. For a comparison, a power plant producing from gas produces up to 2 pounds of carbon dioxide into the atmosphere, and those power plants that work on coal（煤）produce an astonishing 3.6 pounds of greenhouse gases.

    Low costs is another reason why using geothermal power plants should be the first choice for many countries. Geothermal heat systems require 25% to 50% less energy for work compared with the traditional systems for heating or cooling. Besides, geothermal equipment is less big: due to the very nature of geothermal energy, geothermal power plants have only a few moving parts, all of which can be easily sheltered inside a relatively small building. What's more, the life span of geothermal equipment is rather long. All these make geothermal power stations easy to build and keep.

    Businesses are finding more uses for Virtual Reality (VR) as the technology develops. VR is no longer only for gaming or enjoyment. An American company called Blue Goji is using VR to improve one's health by making exercise more fun.

    Blue Goji has offices in Austin, the capital of Texas. The company showed its cardiovascular (心血管的) workout machine, called the Infinity treadmill (跑步机), at the recent South by Southwest festival, an event held every year in Austin.

    A person using the treadmill wears a virtual reality headset when exercising. Before starting, the user tightens a belt to prevent falls. Then, the user plays a VR game while running on the machine. The game can transport the user into the virtual world, where he or she can be racing against virtual people.

    Recently, Leonardo Mattiazzi tested the Infinity treadmill. Mattiazzi said he had a strong feeling to actually get running and do something that pushed his limits. He said the experience was more interesting than running inside the gym without actually going anywhere.

    Constam said the active use of virtual reality helps solve a common problem while wearing a VR headset. She noted that a lot of VR experiences cause motion sickness because people are in motion during the game, but not moving in real life. But when the user is moving on the treadmill and in the game, the chances of motion sickness are reduced.

    However, users who tested the treadmill while wearing the VR headset each had a different experience. Constam said there generally is a learning curve for VR. The first time users feel lost, but "the more you do it, the more you get used to it," she said. Mark Sackler was a first time user. He said he felt a little sick at one point during the game. But he thought the experience was surprisingly realistic.

    After carefully studying the users' experiences, Blue Goji plans to make the treadmill available to the public in 2019.

    There was a gardener who looked after his garden with great care. To water his flowers, he used two buckets(水桶).One was a shiny and new bucket. The other was a very old and dilapidated one, which had seen many years of service, but was now past its best.

    Every morning, the gardener would fill up the two buckets. Then he would carry them along the path, one on each side, to the flowerbeds. The new bucket was very proud of itself. It could carry a full bucket of water without a single drop spilled. The old bucket felt very ashamed(惭愧的)because of its holes: before it reached the flowerbeds, much water had leaked(渗漏)along the path.

    Sometimes the new bucket would say, "See how capable I am! How good it is that the gardener has me water the flowers every day! I don't know why he still uses you. What a waste of space you are!"

    And all that the old bucket could say was, "I know I am not very useful, but I can only do my best. I am happy that the gardener still finds a little bit of use in me, at least."

    One day, the gardener heard that kind of conversation. After watering the flowers as usual, he said, "You both have done your work very well. Now I am going to carry you back, and I want you to look carefully along the path."

    Then the two buckets did so. All along the path, they noticed, on the side where the new bucket was carried, there was just bare earth; on the other side where the old bucket was carried, there was a joyous row of wild flowers, leading all the way to the garden.

    I had a lot of teachers that I loved. However, the teacher that I remember most was Mrs Green from Marianna, Florida. She was my 5th grade teacher. Since I was a new student, not only in her class, but at the school, she made my time there much more pleasant. I immediately began to like her. She was really funny and I knew that she liked me. She made learning fun. I remember one day for Christmas holidays, she taught us how to make ornaments (装饰物) from eggs. My parents still have some of the ornaments I made.

    She made me leader for many group projects and that made me feel special. I think that would make any child feel special, especially when a child is in a new place with no friends. She made me want to be like that. Not to pick a "favourite" student, but to make every student feel that they are special. That year, I received the Presidential Academic Award (美国总统学术奖). I was really proud and so were my parents.

    Looking back at it, I think the reason why I did so well was that I felt important. Students do better when they feel like they are important or loved. Mrs Green always gets to know her students and forms personal relationships with them, which I will try to do some day. I just hope that there will be a student who finds me to their favourite teacher as I found her to be mine.

    Director James Cameron went to new depths for his film-making on Sunday by setting the world record for the deepest ocean dive by a single person.

    This type of extreme research is nothing new to the director. Cameron, 57, is most famous for directing Titanic (1997) and Avantar (2009). During the several years of research for Titanic, he famously traveled to the bottom of the ocean to visit the sunken ship. He also visited the deep sea as research for his fictional 1989 film. The Abyss, which is about a submarine that comes across an alien species. "Most people know me as a film-maker," Cameron said. "But the idea of exploring the ocean has always been the stronger drive in my life."

    Cameron and his team had been preparing for the trip for seven years. On Sunday, Cameron took more than two and a half hours to make the dangerous 6.8-mile journey down to the Trench, an area with near-freezing temperatures, no sunlight, and heavy water pressure. Cameron traveled in a 24-foot-long mini-submarine he helped design, equipped with lights and 3D cameras for filming the adventure. It also had a mechanical arm for collecting samples of soil and deep-sea creatures. Humans had not visited the Mariana Trench since two divers first reached the deep-sea spot in 1960. The divers Don Walsh and Swiss oceanographer Jacques Piccard spent 20 minutes there but could hardly see anything. They took no pictures.

    In his well-equipped submarine, Cameron was able to spend three hours in the Trench, exploring and filming. He plans to use his recordings in a 3D film production for movie theaters and for a National Geographic TV special. "I see this as the beginning," Cameron said. "It's not a one-time deal. This is just the beginning of opening up this new frontier."