What's more exciting than having a fresh hot pizza delivered to your door? How about having it brought to you by a robot? Thanks to Domino's Robotic Unit or DRU, that just became a reality! On March 8, the three-foot tall robot delivered its first pizza to some lucky residents in Brisbane, Australia.

    The fully autonomous DRU is the result of a cooperation between Domino's Pizza Australia and Marathon Robotics.The 450-pound machine that travels at a maximum speed of 12.4 miles an hour can traverse a distance of up to 12 miles and back, before requiring a battery recharge. LIDAR, a laser-based sensor technology similar to the one used in self-driving cars, enables DRU to detect and avoid obstacles, while traditional sensors, much like those used in vacuum robots ensure its path is safe as it heads to its destination.   

    The robot can fit up to ten pizzas and even has a separate cold area to accommodate drink orders.To access their fond, customers have to enter the unique code provided by the company.This is not only ensures that they pick up the right pizza, but also prevents the pies from getting stolen.

    Scientists expert additional DRU's to be ready for service in their various Queensland locations within the next six months. But don't expect these super cute robots to replace humans anytime soon. According to Domino's the DRU still needs extensive testing, which the company believes could take up to two years.

    And then there is also the issue of regulations.The public use of autonomous vehicles is still banned in most countries.But Don Meij, the CEO and Managing Director of Domino's Pizza Australia New Zealand Ltd, is not worried.He is “confident that one day DRU will become an   integral part of the Domino's family.”

Make Up Your Mind to Succeed

    Kind-hearted parents have unknowingly left their children defenseless against failure. The generation born between 1980 and 2001 grew up playing sports where scores and performance were played down because “everyone's a winner.” And their report cards sounded more positive  than ever before. As a result, Stanford University professor Carol Dweck, PhD, calls them “the overpraised generation.”

    Dweck has been studying how people deal with failure for 40 years. Her research has led her to find out two clearly different mind-sets that have a great effect on how we react to it. Here's how they work:

    A fixed mind-set is grounded in the belief that talent is genetic – you're a born artist, point guard, or numbers person. The fixed mind-set believes it's sure to succeed without much effort and regards failure as personal shame. When things get difficult, it's quick to blame, lie, and even stay away from future difficulties.

    On the other hand, a growth mind-set believes that no talent is entirely heaven-sent and that effort and learning make everything possible. Because the ego (自尊) isn't on the line as much, the growth mind-set sees failure as a chance rather than shame. When faced with a difficulty, it's quick to rethink, change and try again. In fact, it enjoys this experience.

    We are all born with growth mind-sets. (Otherwise, we wouldn't be able to live in the world.) But parents, teachers, and instructors often push us into fixed mind-sets by encouraging certain actions and misdirecting praise. Dweck's book, Mind-set: The New Psychology of Success, and online instructional program explain this in depth. But she says there are many little things you can start doing today to make sure that your children, grandchildren and even you are never defeated by failure.

    It was Mother's Day morning last year and I was doing my shopping at our local supermarket with my five-year-old son, Tenyson. As we were leaving, we found that only minutes earlier an elderly woman had fallen over at the entrance and had hit her head on the concrete. Her husband was with her, but there was blood everywhere and the woman was embarrassed and clearly in shock.

    Walking towards the scene, Tenyson became very upset about what had happened to the couple. He said to me, “Mum, it's not much fun falling over in front of everyone.”

    At the front of the supermarket a charity(慈善) group had set up a stand selling cooked sausages and flowers to raise funds. Tenyson suggested that we should buy the lady a flower. “It will make her feel better,” he said. I was amazed that he'd come up with such a sweet idea. So we went over to the flower seller and asked her if we could buy a flower for the lady to cheer her up. “Just take it,” she replied. “I can't take your money for such a wonderful gesture.”

    By now paramedics（救援人员）had arrived, and were attending the injured woman. As we walked up to her, my son became intimidated by all the blood and medical equipment. He said he was just too scared to go up to her. Instead I gave the flower to the woman's husband and told him, “ My son was very upset for your wife and wanted to give her this flower to make her feel better.”

    At that, the old man started crying and said, “Thank you so much, you have a wonderful son. Happy Mother's Day to you.”

    The man then bent down and gave his wife the flower, telling her who it was from. Though badly hurt and shaken, the old lady looked up at Tenyson with love in her eyes and gave him a little smile.

    After Mom died, I began visiting Dad every morning before I went to work. He was frail and moved slowly, but he always had a glass of freshly squeezed orange juice on the kitchen table for me, along with an unsigned note reading, "Drink your juice." Such a gesture, I knew, was as far as Dad had ever been able to go in expressing his love. In fact, I remember, as a kid I had questioned Mom "Why doesn't Dad love me?" Mom frowned, "Who said he doesn't love you?" "Well, he never tells me," I complained. "He never tells me either," she said, smiling. "But look how hard he works to take care of us, to buy us food and clothes, and to pay for this house. That's how your father tells us he loves us."

    I nodded slowly. I understood in my head, but not in my heart. I still wanted my father to put his arms around me and tell me he loved me. Dad owned and operated a small scrap (片) metal business, and after school I often hung around while he worked. Dad fed scrap steel into a machine which looked like a giant pair of scissors with blades thicker than my father's body. If he didn't feed those terrifying blades just right, he risked serious injury. "Why don't you hire someone to do that for you?" Mom asked Dad one night as she bent over him and rubbed his aching shoulders . "Why don't you hire a cook?" Dad asked, giving her one of his rare smiles.

    Many years later, during my first daily visit, after drinking the juice my father had squeezed for me, I walked over, hugged him and said, "I love you, Dad." From then on I did this every morning. My father never told me how he felt about my hugs, and there was never any expression on his face when I gave them.

    Wetlands are ecosystems found in low, flat areas. Often they border ponds, rivers, lakes, and oceans. Wetlands include marshes, swamps, and bogs.

    No trees grow in a marsh, but there are lots of grassy plants. Ducks, turtles, and many different bugs (虫子) live there, too. Florida has the world's biggest freshwater marsh. The Everglades covers 4,000 square miles. The Everglades is not entirely fresh water, however. Near the sea the fresh water and salt water mix. Some plants and animals can live only in this brackish water.

    Saltwater marshes lie along the East Coast and the Gulf of Mexico. During high tide these marshes are under water. During low tide these marshes can be seen. The water rushes out, carrying bits of plants, dead animals, and minerals necessary for sea animals. Many plants and animals depend upon this ever-changing environment.

    Swamps are forested wetlands. Like marshes, they are often found near rivers or lakes and have mineral soil that drain very slowly. Unlike marshes, they have trees and bushes. Swamps have trees that grow with their roots underwater. But the trees will die if their roots stay underwater too long. Animals such as water snakes and frogs live in swamps.

    Bogs have damp, soft soil. So many dead plants have piled up that there is no longer any standing water. This rotting plant matter turns into peat (泥炭). In Ireland and Scotland peat is dried and burned to heat homes. Bog soil is useful for growing wild rice. Lots of insects live there.

    Most people do not find wetlands beautiful. But wetlands are important. Marshes and swamps store water, thus reducing the flooding a heavy rain can cause. About one-third of all of America's endangered plants and animals live in wetlands. Now laws protect some wetlands. More than a dozen wetlands in the US are refuges (保护区) and wildlife preserves.

Learning to Run

    An article published in the scientific journal Nature discusses an important aspect of human evolution. According to Bramble and Lieberman, Professors at the University of Utah, humans possess a number of features that make them surprisingly good runners. “We are confident that the selection for running was important in the origin of the human body form,” says Bramble.

    Traditional thinking has been that humans are poor runners compared to such animals as horses. However, this is only true if we consider running at high speed, especially over short distances. Even an athlete can hardly run as quickly as a horse does, and can only keep up a top speed for 15 seconds or so. But when it comes to long-distance running, humans will do astonishingly well. They can keep a steady pace for many kilometres, and their speed is at least at the same level with that of horses.

    Bramble and Lieberman examined 26 parts of human bodies. One of the most interesting of these is the nuchal ligament (韧带). When we run, it is this ligament that prevents our head from moving back and forth or from side to side. Therefore, we are able to run with steady heads, held high. Then there are Achilles tendons at the backs of our legs, forming the mechanical links between the muscles to the bones. They act like strong strings and help to push us forward when we run. Besides, we have low, wide shoulders, a development which allows us to run more effectively. Add to this our light forearms, which swing in co-operation with the movement of our legs to assist balance, and one begins to appreciate the point that Bramble and Lieberman are trying to make.

    But what advantage is gained from being good long-distance runners? One theory is that this ability may have permitted early humans to obtain food more effectively. Some scientists guess that early humans may have run after animals for great distances to make them tired before killing them. Running would also have shown another advantage: early humans might have eaten the meat left over from a kill by other large animals. They may have been warned of the existence of a freshly killed animal by vultures (秃鹰), and the faster they got to the scene of the kill, the better.

    “Research on the history of human ability of running has traditionally been controversial,” says Lieberman. “At the very least, I hope this theory will make many people have second thoughts about how humans learned to run and why we are built the way we are.”