A mother's love

    I'm a New York City firefighter. Every day, I see terror— sometimes even death. But the day I found Scarlett was different. That day I saw life. And love.

    We were responding to a call about a burning garage. Outside, I heard the sound of cats crying. I couldn't stop — I would have to look for the cats after the fire was put out.

    It took a long time to finally bring the big fire under control, but we did it. No one inside was hurt.

    At that point I was free to investigate the cat noises. There was still a lot of smoke and heat coming from the building. I followed the meowing(猫叫) to a spot on the sidewalk near the front of the garage. There, crying and huddled(挤作一团) together, were five terrified kittens. They must have been inside the building, as their fur was badly singed(烫烧).

    I left the five kittens in a box on a neighbor's porch(门廊).

    I wanted to find the mother. It was obvious that she had gone into the burning garage and carried out all of her babies, one by one —unbelievable.

    We finally found her. She was badly burnt: her eyes were blistered (起水泡), her paws(爪子) were blackened, and her fur was singed all over. You could even see her reddened skin beneath the burned fur. She could barely move. I picked her up, and she relaxed in my arms as much as her pain would allow. Sensing her trust, I shed a tear. I was determined to save this brave little cat and her family.

    The vet told me they would observe the kittens and their mother overnight, but they weren't optimistic about the mother's changes.

    About a week later, I found out she was going to live. One of the technicians suggested we name her Scarlett, because of her reddened skin.

    Knowing what Scarlett endured(忍受) for her kittens, it melted my heart to see her reunited with them. She touched each of them again, nose to nose, to make sure they were all safe. She had risked her life five separate times — and it had paid off. All of her babies had survived.

    As a firefighter, I see heroism(英雄事迹) every day. But what Scarlett showed me that day was the kind of bravery that can only come from a mother's love.

    Tonight, my piano concert was the most important thing in my family. My grandparents were coming by plane to hear me play. Even my busy Aunt Dianne who is on TV every night reading the news, was coming.

    But one thing was for sure. I would never win an award for my piano playing. And that's just because the more I practiced ,the more nervous I got. So there I was, on stage, in my beautiful dress, and I sat down at the piano. But when I started to play, I hit a wrong note. I told myself to start over. But then I hit the wrong note again. It was as if I hadn't practiced at all.

    Finally the disaster was over. I ran off the stage. I couldn't understand why people were applauding. But they were. My mom and my dad had flowers for me, and we were all supposed to go out for a nice dinner, but I couldn't. I just wanted to go home and cry and never go anywhere again. After we went back home, Aunt Dianne just came in and sat down on the side of my bed.

    "It was my first night on the air," she said."I had never been on television before, and I made a mistake. I mispronounced my name and the name of the news show. And you know what? No one even noticed but me. Just like tonight, no one noticed—just you". Aunt Dianne was right. I think we are harder on ourselves than anyone else is. Maybe I will leave my room. And maybe, I'll play the piano again.

    Blowing bubbles is fun! The best thing about bubbles is that it's easy to make your own bubble solution(溶液). You can make as much as you want and blow as many bubbles as you'd like. If you add a "secret" ingredient(配料), you'll get bigger and stronger bubbles! Do just as follows:

    Measure 6 cups of water into one container, then pour 1 cup of dish soap into the water and slowly stir it until the soap is mixed in. Try not to let bubbles form while you stir.

    Measure 1 tablespoon of glycerin(甘油) or 1/4 cup of corn syrup（玉米淀粉） and add it to the container. Stir the solution until it is mixed together.

    You can use the solution right away, but to make even better bubbles, put the lid on the container and let your super bubble solution sit overnight. The soap mixture on the outside of a bubble is actually made of three very thin layers: soap, water, and another layer of soap. A bubble pops when the water that is trapped between the layers of soap evaporates(蒸发). The glycerin or corn syrup mixes with the soap to make it thicker. The thicker skin of the bubbles keeps the water from evaporating as quickly, so they last longer. It also makes them stronger, so you can blow bigger bubbles.

    Dip a bubble wand or straw into the mixture, slowly pull it out, wait a few seconds, and then blow. If you don't have a ready-made "bubble wand", you can make your own by cutting off the end of the bulb of a plastic pipet. Dip the cut end in solution and blow through the narrow end. You can also make a loop out of thin wire or pipe cleaner. Just twist a round end on your wire to blow the bubbles through. You can even make it heart-shaped, square or use other shapes if you're clever enough to bend it well.

    How do the world's only flying mammals communicate? Researchers have observed young bats adopting new “dialects” simply by hearing them repeatedly, making them one of the few animals known to have a capacity for vocal (声音的) learning. “These bats may help us clarify the evolution of speech acquisition (习得) skills,” says Yosef Prat, a PhD at Tel Aviv University (TAU).

    For one year, researchers raised 14 Egyptian fruit bat pups with their mothers in controlled area, exposing each young bat to two different vocalizations: the natural call of its mother and a separate recording that varied in pitch (音高) or frequency. They found that the pups in each group developed a dialect like the recording. “The general assumption in this field is that most animals develop their born vocalizations regardless of what they hear, and that human vocal learning abilities have developed during evolution,” says Mr Prat. “The finding that bats learn the common dialect in their rest place was unusual.”

    Scientists know little about the origin of spoken language, which is believed to have appeared in humans within the past 500,000 years. Dozens of theories attempt to explain the complexity of this skill, but none have done so conclusively.

    “Studying vocal communication and vocal learning in animal models is a very useful way to approach the problem,” says Olga Feher, an assistant professor at the University of Warwick in England.

    But animal vocalizations and human speech are very different things, says Jamin Pelkey, a professor at Ryerson University. “All species communicate. Unlike other animals, though, human beings are able to use sound patterns for functions that are far stranger—functions that are imaginative, theoretical, and critical. When speech is involved in these stranger functions, that is what we mean by spoken ‘language'.”

    Ever walked to the shops only to find, once there, you've completely forgotten what you went for? Or struggled to remember the name of an old friend? For years we've accepted that a forgetful brain is as much a part of ageing as wrinkles and grey hair. But now a new book suggests that we've got it all wrong.

    According to The Secret Life of the Grown-up Brain, by science writer Barbara Strauch, when it comes to the important things, our brains actually get better with age. In fact, she argues that some studies have found that our brain hits its peak between our 40s and 60s— much later than previously thought.

    Furthermore, rather than losing many brain cells as we age, we retain （保留）them, and even produce new ones well into middle age. For years it's been assumed that brain, much like the body, declines with age. But the longest, largest study into what happens to people as they age suggests otherwise.

    This continuing research has followed 6,000 people since 1956, testing them every seven years. It has found that on average, participants performed better on cognitive （认知的）tests in their 40s and 50s than they had done in their 20s. Specifically, older people did better on tests of vocabulary, verbal memory (how many words you can remember) and problem solving.

    Where they performed less well was number ability and perceptual speed－how fast you can push a button when ordered. However, with more complex tasks such as problem-solving and language, we are at our best at middle age and beyond. In short, researchers are now coming up with scientific proof that we do get wiser with age.

    Neuroscientists are also finding that we are happier with ageing. A recent US study found older people were much better at controlling and balancing their emotions. It is thought that when we're younger we need to focus more on the negative aspects of life in order to learn about the possible dangers in the world, but as we get older we've learned our lessons and are sub-consciously aware that we have less time left in life: therefore, it becomes more important for us to be happy.

    Against the supposition that forest fires in Alaska, Canada and Siberia warm the climate, scientists have discovered that cooling may occur in areas where burnt trees allow more snow to mirror more sunlight into space.

    This finding suggests that taking steps to prevent northern forest to limit the release of greenhouse gases may warm the climate in northern regions. Usually large fires destroyed forests in these areas over the past decade. Scientists predict that with climate warming, fires may occur more frequently over next several centuries as a result of a longer fire season. Sunlight taken in by the earth tends to cause warming, while heat mirrored back into space tends to cause cooling.

    This is the first study to analyze all aspects of how northern fires influence climate. Earlier studies by other scientists have suggested that fire in northern regions speed up climate warming because greenhouse gases from burning trees and plants are released into the atmosphere and thus trap heat.

    Scientists found that right after the fire, large amounts of greenhouse gases entered the atmosphere and caused warming. Ozone (臭氧) levels increased, and ash from the fire fell on far-off sea ice, darkening the surface and causing more radiation from the sun to be taken in. The following spring, however, the land within the area of the fire was brighter than before the fire, because fewer trees covered the ground. Snow on the ground mirrored more sunlight back into space, leading to cooling.

    "We need to find out all possible ways to reduce the growth of greenhouse gases in the atmosphere." Scientists tracked the change in amount of radiation entering and leaving the climate system as a result of the fire, and found a measurement closely related to the global air temperature. Typically, fire in northern regions occurs in the same area every 80 to 150 years. Scientists, however, found that when fire occurs more frequently, more radiation is lost from the earth and cooling results. Specifically, they determined when fire returns 20 years earlier than predicated, 0.5 watts per square meter of area burned are soaked up by the earth from greenhouse gases, but 0.9 watts per square meter will be sent back into space. The net effect is cooling. Watts are used to measure the rate at which energy is gained or lost from the earth.