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    A recent experiment proves that bees can save time and energy when they fly around to different flowers.

    Dr Nigel Raine, from the Royal Holloway University of London, has always been interested in finding out why animal behave like they do. He is also interested in bees. It was not a surprise when he and some other scientists from Queen Mary University of London discovered that bees can quickly solve a problem that takes computers many days.

    Flowers make pollen (花粉), and when bees visit them, they carry the pollen to other flowers. The plants need the pollen to make seeds that will grow. Dr Raine notes that we get a lot of our food from plants, so it is important to know how the bees move around and take the pollen between flowers. The scientists wanted to examine the journey that the bees take and how they save energy when they do this. They completed the experiment on the roof of Queen Mary University, using artificial flowers and a large amount of nectar, a sweet liquid produced by flowers. They taught one bee to visit all the flowers in one place at the same time. When the bee got to know the location of the flowers well, they saw how it flew around and returned home with the nectar. After this, they changed the locations of the flowers. The scientists thought the bee would follow the route it knew already. This would mean that it followed a longer route than it needed to, and so it would use more energy. They watched the bee carefully as it travelled between the flowers in their new location, and they made notes. But in the experiment, the bee changed its route and flew a shorter distance.

    The problem that the bee solved is similar to a maths puzzle called the 'travelling salesman problem'. A salesman who goes to different places to sell things wants to travel the shortest distance. But he has to calculate the length of many possible routes to know which one is the shortest. A computer can calculate this but the experiment shows bees can do the same calculation quickly with a tiny brain. Scientists are very interested in how they do this. It would help us to understand how pollen is moved around. In addition, if they find this out, it could help us to improve communication networks. This might help humans to reduce traffic jams when there is an accident, for example.

    We humans love to stare into our smart devices. We gaze for hours—about 10 hours and 39 minutes a day—at our computers, smartphones, tablets and televisions. Is all this staring bad for us? It might be, mainly because as we stare at our devices we are exposing ourselves to blue light.

    Blue light is a type of electromagnetic radiation with a very short wavelength that produces a high amount of energy. While it's true that light can damage our eyes under certain circumstances, there's no scientific evidence suggesting that blue light is harmful to our eyes. But many people still think it is, which is why blue light—blocking glasses are so popular. So do the glasses work?

    “Everyone is very concerned that blue light may be causing damage to the eye, but there's no evidence that it may be causing serious damage, "Dr. Rahul Khurana, clinical spokesman for the American Academy of Ophthalmologists, told Business Insider.

    Blue light exposure is nothing new. In fact, the sun is the largest source of blue light. Moreover, blue light is also present in LED light. But if blue light isn't harmful, then why are we constantly rubbing our eyes when we're looking at our screens? The answer is eyestrain(眼疲劳):More than 60 percent of people experience eye problems associated with digital eyestrain. And blue light, it seems, isn't the cause. Instead, our eyes are so strained because most of us blink less when we stare at our digital devices. So if eyestrain is the real issue, blue light-blocking glasses are probably of little use.

    As the weekend approaches, perhaps you're looking forward to a meal out or sitting in front of the TV with a takeaway. But as you settle down to enjoy that comforting plate of beef or start spooning that fragrant lamb curry over the rice, will you be worrying about whether you are really eating what was written on the menu?

    Yesterday it was revealed by the Food Standards Agency that more than a fifth of the 665 meat samples tested last year contained DNA from animals not listed on the label. Of the 145 problem samples, 73 came from supermarkets, while 22 came from processing plants. The remaining 50 all came from restaurants.

    I have no doubt that over the next few years, the percentage of meal coming from dubious origins will continue to rise unless something drastic is done. Why? There are two main reasons. First, too many businesses are willing to boost their profits by adulterating their products in the meat industry. I believe there is a systemic problem within the meat industry that makes it particularly attractive to unscrupulous characters who are really nothing more than criminals，the second is the complexity and length of the meat supply chain. If you buy a chicken-based ready meal from a supermarket, as you might imagine, that chicken will pass through many hands before it ends up on your plate here. Worse still, the meat will often he partially processed somewhere along that chain—usually with salt and water added to boost flavour and volume—which is quite legal.

    Obviously, it is impossible for consumers to be detectives about every piece of meal they eat.

    However, what you can do is to avoid processed foods and never buy ready meals. Stay away from burgers made in factories. Don't go to chain restaurants. Instead, go to local, independent restaurants where it is more likely the chef and owner—often the same person—cares about where the meat comes from, and will be happy to tell you. So, try to buy your meat from a good local butcher.

    And no, what I am suggesting is not going to hurt your purse or wallet. The essence, then, is to buy meat that has had as small a journey from field to fork as possible, because that is the only way you can he sure of what you eat. It's that simple.

    February has long been a month of romance. With the sweet smell of roses in the air, romantic films hit cinemas and love stories fill newspapers and magazines.

    On the 14th day, it is customary for a boy to take his girlfriend out to dinner, buy her flowers and chocolates, write poems, sing to her or even spell out her name with rose petals!

    This is the scene that greets you on Valentine's Day, named after Valentine who was a priest in third century Rome. When the emperor decided that single men made better soldiers than those with wives, he banned marriage.

    But Valentine continued to perform marriage ceremonies for young lovers in secret. When his actions were discovered, the emperor had him put to death.

    While in prison, it is said that Valentine fell in love with the daughter of his prison guard. Before his death, he wrote her a letter, which he signed "From your Valentine", an expression that is still in use today.

    Valentine died for what he believed in and so was made a Saint, as well as becoming one of history's most romantic figures.

    Nowadays, Valentine's Day wins the same popularity among Chinese young people. It is a time when students "don't want to be alone" according to Gao Shunjie, a student reporter for 21st Century Teens in Jinling High School, Nanjing. Some of her classmates are planning to make Valentine's cards for parents, teachers and friends. Others want to hold parties at which they will exchange small gifts and eat heart shaped cakes. The idea is to have fun and encourage people to share in the spirit of St Valentine.

    Edward Latter, five, thought his dog Morse was gone for ever after cruel thieves took him away when the dog escaped from his home.

    The 10-month-old dog had been missing since December and the broken-hearted boy even wrote a heartbreaking letter to Santa and posted it to Lapland asking for his pal back for Christmas.

    A ￡10,000 reward was offered by millionaire Simon Cowell after he read about the horrific theft. Cowell said: "It's heartbreaking to see a little boy's Christmas ruined. Dogs are so important to many of us. We just hope it helps lead to the safe return of Morse."

    His parents, Amanda Hopkins and Richard Latter, had given up hope of ever seeing their pet again, until they got a call on Friday night. A couple 20 miles away from their home in Marden, Kent, had found a muddy dog walking through their street and thought it could be missing Morse. They brought the Morse in, washed him, and then called Mr Latter who was unsure until he was sent a photo, and then drove the family to the village of Meopham.

    The theatre carpenter, 40, said: "Amanda and I were still quite sceptical, but Edward saw him and recognised him straight away. He was absolutely over the moon. He said: 'I can't believe it, I have my best friend back. It's too late for Christmas but this is the best present ever.' We were still unsure if it was him though—as he wasn't responding to his name or coming to us."

    "We spent about an hour and half over there and we still were not sure, so we took him home to get his chip scanned. It was only when we took him to the vets on Saturday morning and got his chip scanned that we found out for sure. We instantly broke down in tears. We were just hugging each other, hugging Edward and hugging the dog." Added Richard.

    The family who found missing Morse said they hadn't yet heard from Simon Cowell about the ￡10,000 reward hut were happy to get him home.