If we were asked exactly what we were doing a year ago，we should probably have to say that we could not remember. But if we had kept a book and had written in it an account of what we did each day, we should be able to give an answer to the question．

    It 1s the same in history．Many things have been forgotten because we do not have any written account of them. Sometimes men did keep a record of the most important happenings in their country, but often it was destroyed by fire or in a war．Sometimes there was never any written record at all because the people of that time and place did not know how to write．For example，we know a good deal about the people who lived in China 4,000 years ago，because they could write and leave written records for those who lived after them．But we know almost nothing about the people who lived even 200 years ago in Central Africa，because they had not learned to write．

    Sometimes，of coures，even if the people cannot write，they may know something of the past．They have heard about it from older people，and often songs, dances and stories have been made about the most important happenings, and these have been sung，acted and told for many generations，for most people are proud to tell what their fathers did in the past．This we may call”remembered history”．Some of it had been written down. It is not so exact or so valuable to us as written history is，because words are much more easily changed when used again and again in speech than when copied in writing．But where there are no written records，such spoken stories are often very helpful．

    When it comes to gifts, it's not easy to shop for someone when you're not sure what they're into. Thankfully, Crate and Barrel's sister store — the modern, fancy version — CB2 has a gift collection that is just as beautiful as it is practical. They're known for their modern designs. We've edited a list of some of our favorite gift ideas from CB2 so you'll know just what to get.

    Galactic Jewelry Box ($21)

    This jewelry box is not only a place to store your jewels, but it looks like one itself. “Designed by UK-based Seascape Curiosities, the jewelry box brings deep space to your room. Open storage space lined with light grey cotton velvet holds most-precious possessions,” CB2 states. The best part? It's under $25.

    Flamingo Catchall ($29.95)

    Designed by the British fashion designer Matthew Williamson, this flamingo catchall is a pop of color in every room and offers a secure place to store some of your favorite rings, earrings, or little items. Not only is it an awesome addition to just about any home, it's also a great conversation starter at dinner parties.

    Heritage Navy Leather Activity Ball ($49)

    It's a great gift for the man in your life who loves sports. Crafted with design and function in mind, handmade activity ball (think of it as a smaller basketball) stands up to years of play and even gets better looking with age. It's a super addition to any bookshelf.

    Black Nickel Cocktail Shaker ($24.95)

    This cocktail shaker starts off with a smoky black finish and fades into grey. It's fashionable, functional, and — above all — easy to clean.

    Which tablet computer should YOU be buying: They are this year's must have ... and there's a style to suit everyone.

    When people see machines that respond like humans, or computers that perform amazing feats of strategy, they sometimes joke about a future in which humanity will need to accept robot overlords. But buried in the joke is a seed of unease. Science fiction writing and popular movies have shown us about artificial intelligence (AI) that exceeds the expectations of its creators and escapes their control, eventually outcompeting and enslaving humans or targeting them for extinction(灭绝).

    Even in the real word, not everyone is ready to welcome AI with open arms. In recent years, as computer scientists have pushed the boundaries of what AI can accomplish, leading figures in technology and science have warmed about the frightening dangers that artificial intelligence may pose to humanity, even suggesting that AI capabilities could destroy the human race.

    But why are people so frightened about the idea of AI?

    Elon Musk is one of the famous voices that have raised red flags about AI, In July 2017. Musk told attendees at a meeting of the National Governors Association, I have exposured to the very cutting-edge Al, and I think people should be really concerned about it. I keep sounding the alarm bell. But until people see robots going down the street killing people, they don't know how to react, because it seems so impossible."

    Earlier, in 2014, Musk had labeled AI "our biggest existential threat," and in August 2017, he declared that humanity faced a greater risk from AI than the terrorists. Physicist Stephen Hawking, who died on March14, also expressed concerns about AI, telling the BBC in 2014 that "the development of full artificial intelligence could spell the end of the human race.

    When I was about twelve, I headed to a restaurant for dinner with my family. It was winter, and on that night, the wind was really blowing hard.

    As my mom and I headed to the restaurant from our car, a girl about my age and her mother came up to us. They asked if we had any spare change (零钱). My mom right away asked where they lived. They pointed to an old car in a parking lot across the street. The girl said there were six of them living in that car. My mom said she had something to do after handing the people a few dollars. She sent me inside the restaurant with my dad and my three siblings (兄弟姐妹). But she didn't come. Later, I found out she had gone home and put all the food in our cupboards (食橱) into a few bags. Then, she brought that food over to the car and handed the bags to the family. I wasn't there when that happened, but I can only imagine the joy it brought to those people.

    A few days later, when I actually found out about what she had done, I asked her why she helped those people. She told me that they were not lucky. I remember the face of that girl who had asked us for change. She was the same age as me, yet we looked so different.

    Here I stood, dressed in almost new clothes, headed to eat in a restaurant and then back home to the bedroom I shared with my younger sister. I remember thinking that the other girl didn't have any food to eat and she was heading back to a cold car shared with five other people.

    After painting this picture in my mind, I understood why my mom had done what she did. I will never forget what she did that night, and how she taught me one of the best lessons I ever learned.