How fit are your teeth? Are you lazy about brushing them? Never fear: An inventor is on the case. An electric toothbrush senses how long and how well you brush, and it lets you track your performance on your phone.

    The Kolibree toothbrush was exhibited at the International Consumer Electronics Show in Las Vegas this week. It senses how it is moved and can send the information to an Android phone or iPhone via a Bluetooth wireless connection.

    The toothbrush will be able to teach you to brush right (don't forget the insides of the teeth!) and make sure you're brushing long enough. “It's kind of like having a doctor actually watch your brushing on a day-to-day basis,” says Thomas Serval, the French inventor.

    The toothbrush will also be able to talk to other applications(应用) on your phone, so developers could, for example, create a game controlled by your toothbrush. You could score points for beating monsters(怪物) among your teeth. “We try to make it smart but also fun,” Serval says.

    Serval says he was inspired by his experience as a father. He would come home from work and ask his kids if they had brushed their teeth. They said “yes,” but Serval would find their toothbrush heads dry. He decided he needed a brush that really told him how well his children brushed.

    The company says the Kolibree will go on sale this summer, for $99 to $199, depending on features. The U.S. is the first target market.

    Serval says that one day, it'll be possible to replace the brush on the handle with a brushing unit that also has a camera. The camera can even examine holes in your teeth while you brush.

    Here we list some cartoons that have continued up until now without an end, and among them there may be a favorite from your childhood:

Detective Conan

    Detective Conan has broadcasted since 1996 by V1 Studio in Japan. Now, it has 910 series without an end in sight. This cartoon makes many teenagers keen on detective stories. Although there are constant guesses about the ending of the cartoon, Detective Conan continues to update every week.

One Piece

    One Piece has been serialized since 1997. Until now, it has 784 series in total, and the number will continue grow in the future. This cartoon tells the story of a great adventurous journey among some hot-blooded youngster. Long may the journey continue…

Fairy Tail

    Fairy Tail has been serialized since 2009. It has a current total of 277 series. This cartoon tells the passionate story of teenagers in a magical world. Many people hope to achieve their magical dreams through such cartoons, creating an inspiration that lasts through to adulthood.

GINTAMA

    GINTAMA is a more recent cartoon released in 2006 April 4th, and it has serialized 329 sets in the past 11 years. It was introduced to China in 2014 July 10th.

Hell Girl

    Until now, Hell Girl has finished three seasons since its first season was serialized in 2005. This cartoon has 26 series each season, much less compared with other cartoons. According to the newest information, the fourth season of the cartoon is going to begin in July this year. The long-awaited return of Hell Girl will bring back a lot of memories for many people!

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    January means it's time for coats and gloves and cold weather. While many of us are preparing ourselves for the cold weeks ahead, in some cities winter is the “hottest” season of all because it's the time for winter festivities.

    Every year 2 million people visit the Sapporo Snow Festival in Japan. This internationally well-known event began in 1950, when some local high-school students built six snow statues in Odori Park. Since then, the festival has grown to include lots of snow sculptures as well as a snow-sculpting contest that draws competitors from all over the world.

    In December, Finland created its 13th annual Snow Village, which will remain open until April, if weather permits. Snow Village lies nearly 200 kilometers north of the Arctic Circle. The village is designed by builders skilled in working with snow and ice. Visitors can take a tour of the village, eat in a restaurant made of ice or go dancing in the disco igloo(拱形圆顶小屋). They can also spend the night in a hotel made of snow. There's even an ice chapel(小礼拜堂) for couples who want to get married in Snow Village.

    Since 1935, the Fur Rendezvous has been held every February in Anchorage, Alaska, America's most northern state. Among the festival's many attractions is the World Championship Sled Dog Race, which draws sled dog teams from many countries. Dogs also take center stage in the Dog Weight Pull, in which dogs compete to see which one can pull the heaviest weight. The festival features sports like skiing, basketball, boxing and softball as well as the Grand Prix Auto Race in downtown Anchorage. True to the festival's name, there's also a fur auction(拍卖), where buyers buy real Alaskan furs. The first Fur Rendezvous lasted only three days. Now it's a 10-day event that attracts thousands of visitors.

    Angel Garcia Crespo is a computer engineer at Carlos III University of Madrid in Spain. His group has invented a new way for deaf-blind people to “watch” TV. The idea for the technology grew out of previous work by his group. The team had already worked on making audiovisual(视听的) materials accessible to people with either vision or hearing disabilities. But the group wanted to help people with both challenges. So they asked some deaf-blind people what would help.

    In addition to relying on their sense of touch to communicate, deaf-blind people can also get and send information with a Braille line. The Braille system uses patterns of raised dots to stand for letters and numbers. A Braille line is an electronic machine with a changeable Braille display. Dots rise up or drop down based on the information sent to the machine.

    Now the new system changes TV signals to data a Braille line can use. “The key to the system is the possibility of using subtitles(字幕) to collect TV information, " Garcia Crespo explains. "Subtitles travel with the image(影像) and the audio in electromagnetic waves we don't see. But an electronic system can keep those waves."

    First, a computer program, or app, pulls out the subtitles and visual descriptions from the broadcast signal. The system then combines the information and changes both into data for Braille.

    Now another app gets to work, which sends the data out to people's Braille lines on demand. “This is done in real time, in less than a second, " Garcia Crespo says. This lets a deaf-blind person "watch" TV as it's broadcast. The system will work with various Braille lines, as long as there's a bluetooth connection available. Now, the system is only used in Europe, and it should soon be available in the US.

    There is an English saying that says, "Let Sleeping Dogs Lie." It means not bringing up an old problem. Researchers in Hungary have found another reason to let dogs keep on sleeping. It seems the animals are learning while they sleep.

    The Hungarian researchers placed tools on the dogs' heads to know about electrical activity in the brain. The brain activity, called sleep spindles(梭状波), takes place in human begins, and has been connected with learning. The researchers hope to understand how the dogs' ability to learn and remember changes as they get older. The study may help them understand how human brains change as we age.

    The researchers found differences between male and female dogs. Iotchey, a researcher, says the females appeared much better at learning new things. Female dogs have about twice as many spindles per minute as male dogs, they also happen to be the better learners, and they memorize the task much better. But it was harder for all the older dogs to remember things, especially when several things were happening at the same time.

    DoraSzabo also studies sleep spindles. Szabo is a neuroscientist in a university in Budapest. She says the older dogs have fewer spindles and are easily cheated. "If you first hide the reward into one bowl, then in another and in another, they get lost after a while. So their performance is going down, and they are getting poor in solving new problems."

    Researchers hope the study will not only help understanding of learning ability and memory changes in dogs, but also the aging of humans. Senior Researcher EnikoKubinyi adds that the aging dogs suffer from the same problems as humans who are aging. “Among very old dogs, up to two thirds of them show signs of dementia(痴呆), and this dementia is really very similar to that of humans, so we could use dog as a natural model of human aging."

Gottfried Wilhelm von Liebniz was a philosopher and mathematician in search of a model. In the late 1600s Leibniz decided there was a need for a new, purer arithmetic than our common decimal (十进制) system. He got his inspiration from the 5000-year-old book that is at the heart of Chinese philosophy: the I-Ching, or Book of Changes.

This ancient text was such an influence on Liebniz that he titled his article on the new arithmetic "Explanation of a new arithmetic and the ancient Chinese figure of Fu X". Fu Xi was the legendary first author of the I-Ching. The arithmetic that Liebniz described was binary (二进制) code, which is used in almost every modern computer, from iPhones to China's own Tihane-2 supercomputer.

To figure out what Liebniz learned in the I-Ching, we need to understand something that most of us have taken for granted. When we listen to an MP3, look at a digital photo or watch the latest TV drama, we are experiencing a digital representation of reality. That representation is basically just a string of binary signals that are commonly known as 1s and 0s. What Liebniz's gained from the book was that even the most complex reality could be represented in the binary form as 1s and 0s.

In the philosophy of the I-Ching, reality is not entirely real. It is something more like a dream. This dream of reality arises from the binaries of Yin and Yang, as they play out countless combinations, practically everything in the universe. It's not surprising then, from the l-Ching's perspective, that anything in the dream of reality can be represented in a string of 1s and 0s, processed by a computer.

The I-Ching was far more ambitious than the current practical applications of binary code. It is claimed that the I-Ching represents nothing less than the basic situation of human life itself. As a system for predicting the future, the I-Ching might disappoint, but as a way of questioning your own unconscious mind, it can be remarkably useful.

The I-Ching's teachings also contain warnings about our digital revolution. Binary code, powered by modern computers, has an amazing capacity to represent reality. However, the ancient authors of the I-Ching might have understood its potential-and its dangers-even better than we now do.

So when scientific thinkers ask whether computers can create "virtual realities" or "artificial intelligence", they are missing the point. Of course, we can create ever deeper and more complex layers of the dream of reality. The real question is, can we wake up from the dream we're in already?