There's no doubt that man is the smartest. But do you know what other animals are smart, too?

Dolphins

    Dolphins are very smart. Most of the “tricks” they're taught to do are actually behavior they would engage in on their own. They love to play, race and generally enjoy their life to the fullest. They speak a language we have yet to completely understand and like all civilized creatures, dolphins' mothers always provide their young children with guidance and possibly, love.

Great apes

    The great ape family primarily consists of gorillas, chimpanzees and orangutans. Their brain chemistry is so similar to humans' that NASA once used chimpanzees in place of astronauts during many dangerous missions. Gorillas have been taught sign language and orangutans exist in complex familial relationships.

Elephants

    Everyone has heard the phrase “an elephant never forgets”. Elephants establish long-term friendships, recognizing and remembering their friends years later. If an elephant comes upon a fallen friend, it has even been known to feel sad.

Parrots

    As proved by this list, parrots are very smart. They are also the only animals listed that can actually hold a conversation. Some parrots know hundreds of words by imitating humans. The birds are also capable of remembering words and using them intelligently in response to situations.

A

    One warm summer morning, Elizabeth, the nanny（保姆）of the William's, went back from outside with the little boy, Josh. When she stepped into the house from the front door, she could tell that something was wrong, but she couldn't point a finger at exactly what it was. Just as she was about to dash out to find Josh, the little boy ran from behind her back, straight into the house for his toys.

    That's when she heard footsteps coming down the stairs. Her heart missed a beat. Knowing that Josh's parents were not home, she ran inside the house, caught the little boy swiftly and headed straight for the gate. She hit the neighbor's door heavily to seek help and called the police.

    When David William returned home and checked the monitor, what he saw scared the life out of him. A strongly built middle-aged stranger walked around the house and searched every corner, being careful not to miss any valuables（贵重物品）. And the most frightening for David was to see him even slipping into Josh's room. It was also terrifying to see that he was on his phone with someone guiding him on what to do. When Elizabeth opened the front door, he realized it was time to leave. He ran out just a few moments after Elizabeth and the boy left, getting away from the police.

    The Williams feel so grateful to Elizabeth for what she has done daily and saving their little boy when she could have easily run leaving the child behind. Elizabeth is called “supemanny” by the family. But Elizabeth said it was just her normal duty. “When his parents are away, they put their trust in me to keep him safe.” Although she is still terrified at the thought of what could have happened if she had come face to face with that man, she is willing to continue doing her work.

    Medicine is the most noble of all the arts, but owing to the ignorance of those who practice it, and those who inconsiderately form a judgment of them, it is now far behind all the other arts. Their mistake appears to me to arise principally from the fact that there is no punishment for the practice of medicine except disgrace, and that does not hurt those who are familiar with it. Such persons are like the figures introduced in tragedies, for as they have the shape, and dress, and appearance of an actor, but are not actors, so also physicians are many in title but very few in reality.

    Whoever is to acquire a competent knowledge of medicine ought to process the following advantages: a natural character; instruction; a favorable position for the study; early tuition; love for labor; leisure. First of all, a natural talent is required, for Nature leads the way to what is most excellent; then instruction in the art takes place, which the student must try to adopt by reflection, becoming an early pupil in a place well adapted for instruction. He must also bring to the task a love of labor and perseverance to ensure the instruction takes root.

    Instruction in medicine is like the culture of the productions of the earth. For our natural character, is, as it were, the soil; the principals of our teacher are, as it were, the seed. Instruction in youth is like the planting of the seed in the ground at the proper season. Diligent study is like the cultivation of the fields; and it is time which passes on strength to all things and brings them to maturity

    Having brought all these essentials to the study of medicine, and having acquired a true knowledge of it, we shall thus, in travelling around, be respected physicians not only in name but in reality. Inexperience is a bad trait, and does harm to those who possess it, nurturing either timidity or audacity(胆大安为). For timidity reveals a want of powers, and audacity a lack of skill. Physicians who are eager for power or those who are undertrained are not a blessing to a community.

    Those things which are sacred or noble, are to be delivered only to sacred persons; and it is wrong to import them to the profane until they have been initiated in the mysteries of the science.

    Google, hoping to put down a protest by employees upset that the technology they were working on could be used for deadly purposes, will not renew a contract with the Pentagon(五角大楼) for artificial intelligence work when a current deal expires next year.

    Diane Greene, who is the head of the Google Cloud business that won a contract with the Pentagon's Project Maven, said during a weekly meeting with employees Friday that the company was backing away from its AI work with the military, according to a person familiar with the discussion but not permitted to speak publicly about it.

    Google's work with the Defense Department on the Maven program, which uses artificial intelligence to interpret video images and could be used to improve the targeting of drone strikes, riled the internet giant's workforce.

    About 4,000 Google employees signed a petition(请愿书) demanding "a clear policy stating that neither Google nor its contractors will ever build warfare technology," and a handful of employees resigned in protest.

    The money for Google in the Project Maven contract was never large by the standards of a company with profit of $110 billion last year — $9 million, one official told employees, or a possible $15 million over 18 months, according to an internal email.

    But some company officials saw it as an opening to much greater revenue down the road. In an email last September, a Google official in Washington told colleagues she expected Maven to grow into a $250 million-a-year project, and eventually it could have helped open the door to contracts worth far more.

    We human beings haven't been good friends to animals. For thousands of years, we have been polluting the environment, making it hard for animals to live on the planet. We have been killing animals for their fur, feathers or meat, or simply because they are dangerous. As a result, many kinds of animals have disappeared forever. Hundreds more are on the endangered list today.

    Should we care about animals? Of course we should. If animals of a certain kind all disappear, they will never come back again. Animals are more than just resources of things we need. Every kind of animal has its place in the balance of nature. Destroying any kind of animal can lead to many problems. For example, when farmers killed large numbers of hawks(鹰), the corn and grain that the farmers stored were destroyed by rats and mice. Why？Because hawks eat rats and mice. With less and less hawks to keep down their numbers, rats and mice multiplied quickly. And if people kill too many birds, the fields will be bothered with insects. It is because birds eat insects. When there are less and less birds, more and more insects will eat the crops.

    Luckily, we've realized that we shouldn't kill animals any more. And people are working hard to save those animals that would disappear soon. The government also passed laws to protect the endangered animals. In fact, quite a few countries have passed such laws. These laws forbid the killing of any kind of animal on the endangered list. We should try our best to protect and save the endangered animals.

    Join the ranks of bright travelers and load up your smart phone with these must-have travel apps.

    Sky Scanner

    Stop wasting precious time clicking through website after website for airfare deals. Searching over 1,000 airlines and travel agents, Sky Scanner locates the cheapest dates to fly as well as the most affordable destinations. Got your heart set on some place special? Just enter your destination, dates, and the number of travelers and the app does all the heavy lifting for you.

    Easy Travel

    Just enter your city, or postal code into the search window, and Easy Travel will display the cheapest gas being served up near you. Whether you're driving in Canada, or the United States, Easy Travel is by your side helping you save money.

    Bother Free

    Don't be lost in translation. Here's an app that will serve as your travel translator, translating over 60 languages for your communication pleasure. It's easy! Just select the language you want to learn, speak or type a phrase into your phone, and the app will deliver a translation that you can read and hear.

    World Atlas

    You can have the whole world in your hands! National Geographic's beautiful award-winning World Atlas app is a must-have for armchair travelers and globetrotters alike. Spin, expand, and zoom the 3D globe to access detailed maps, tools to measure distances and need-to-know facts such as current weather, demographics and currency.