By the mid-nineteenth century, the term “icebox” had entered the American language, but ice was still only beginning to affect the diet of ordinary citizens in the United States. The ice trade grew with the growth of cities. Ice was used in hotels, pubs, and hospitals, and by some forward-looking city dealers in fresh meat, fresh fish, and butler. After the Civil War (1861-1865), as ice was used to refrigerate freight cars(货车), it also came into household use. Even before 1880, half the ice sold in New York, Philadelphia, and Baltimore, and one-third of that sold in Boston and Chicago, went to families for their own use. This had become possible because a new household convenience, the icebox, a precursor（前身）of the modem refrigerator, had been invented.

    Making an efficient icebox was not as easy as we might now suppose. In the early nineteenth century, the knowledge of the physics of heat, which was essential to a science of refrigeration, was undeveloped. The common belief that the best icebox was one that prevented the ice from melting was of course mistaken, for it was the melting of the ice that performed the cooling. Nevertheless, early efforts to economize ice included wrapping the ice in blankets, which kept the ice from doing its job. Not until near the end of the nineteenth century did inventors achieve the delicate balance of insulation(绝缘) and circulation needed for an efficient icebox.

    But as early as 1803, an intelligent Maryland farmer, Thomas Moore, had been on the right track. He owned a farm about twenty miles outside the city of Washington, for which the village of Georgetown was the market center. When he used an icebox of his own design to transport his butter to market, he found that customers would pass up the rapidly melting butter of his competitors to pay an extra price for his butter, still fresh and hard in neat, one-pound bricks. One advantage of his icebox, Moore explained, was that fanners would no longer have to travel to market at night in order to keep their produce cool.

    A new study of 8,000 young people in the Journal of Health and Social Behavior shows that although love can make adults live healthily and happily, it is a bad thing for young people. Puppy love, (早恋) may bring stress for young people and can lead to depression. The study shows that girls become more depressed than boys, and younger girls are the worst of all.

    The possible reason for the connection between love and higher risk of depression for girls is “loss of self”. According to the study, even though boys would say “lose themselves in a romantic relationship”, this “loss of self” is much more likely to lead to depression when it happens to girls. Young girls who have romantic relationships usually like hiding their feelings and opinions. They won't tell that to their parents.

    Dr Marianm Kaufman, an expert on young people problems, says 15% to 20% young people will have depression during their growing. Trying romance often causes the depression. She advises kids not to jump into romance too early. During growing up, it is important for young people to build strong friendships and a strong sense of self. She also suggests the parents should encourage their kids to keep close to their friends, attend more interesting school activities and spend enough time with family.

    Parents should watch for signs of depression-eating or mood changes-and if they see signs from their daughters or sons, they need to give help. The good news is that the connection between romance and depression seems to become weak with age. Love will always make us feel young, but only maturity gives us a chance to avoid its bad side effects.

Most people, when they travel to space, would like to stay in orbit for a few days of more. And this stands to reason, if you're paying $20,000 for your trip to orbit! Strain order for tourism to reach its full potential there's going to be a need for orbital accommodation—or space hotels. What would a space hotel actually be like to visit? Hotels in orbit will offer the services you expect from a hotel—private rooms, meals, bars. But they'll also offer two unique experiences: impressive views—of Earth and space—and the endless entertainment of living in zero gravity—including sports and other activities that make use of this.

The hotels themselves will vary greatly—from being quite simple in the early days to huge luxury structure at a later date. It's actually surprising that as later as 1997; very few designs for space hotels were published. This is mainly because those who might be expected to design them haven't expected launch costs to come down far enough to make them possible.

    Lots of people who've been to space have described vividly what it's like to live in zero gravity. There are obviously all sort of possibilities for dancing, gymnastics, and zero-G sports. Luckily, you don't need to sleep much living in zero gravity, so you'll have plenty of time for relaxing by hanging out in a bar with a window looking down at the turning Earth below.

Of course all good things have come to an end. Unfortunately, and so after a few days you'll find yourself heading back enough you'll be much more expert at exercising in zero gravity than you were when you arrived. You'll be thinking how soon you can save up enough to get back up again—or maybe you should change jobs to get to work in an orbiting hotel.

    A 3-year-old boy who was lost in the woods for two days is now safe at home with his family. But Casey Hathaway told his rescuers that he was not alone in the rainy, freezing cold woods. He said he was with a friend — a bear.

    The child went missing on January 22. He was playing with friends at his grandmother's house in the southern state of North Carolina. When the other children returned home but Casey did not, the family searched the area for almost an hour before calling the police. Police formed a search and rescue team to look for the young boy in the nearby woods. But two days went by and still — no Casey.

    Then on January 24, someone called the police saying he heard a child crying in the woods. Police followed up on the information and found Casey at about 9:30 that night. They pulled him out of some briar. He was in good health. Casey told the rescuers that he had hung out with a black bear for two days, a bear he called his "friend".

    Sheriff Chip Hughes spoke with reporters from several news agencies. He said Casey did not say how he was able to survive in the woods for three days in the cold, rainy weather. However, the sheriff said, "He did say he had a friend in the woods that was a bear that was with him."

    Hundreds of people helped in the search and rescue efforts, including some 600 volunteers, federal police and members of the military. Officer Hughes told reporters that at no point did he think Casey had been kidnapped.

    His mother Brittany Hathaway talked with reporters from a local news agency and thanked everyone who joined the search for her son. "We just want to tell everybody that we're very thankful that you took the time out to search for Casey and prayed for him, and he's good," said his mother. "He is good, he is up and talking. He's already asked to watch Netflix. So, he's good …"

Nature supports us in a wide variety of ways, whether we are conscious of these gifts or not. {#blank#}1{#/blank#}By following these tricks for first-time campers, anyone can engage with nature in a more grateful way.

Take full advantage of Nature

If you're close to flowing water, you can choose from various approaches to stay hydrated, as well as wash dishes and do laundry, without taking much trouble to bring all your water with you. {#blank#}2{#/blank#}This is a fantastic way to begin your day.

Do your Research

{#blank#}3{#/blank#}Some trees supply wood that's appropriate for making walking sticks. Some wood is suitable for starting fires, while other wood is fit for keeping them going. Other trees may provide nuts and fruits.

Fully Enjoy Nature

My hope is that the strategies for first-time campers will help you appreciate the great outdoors. Whether you're hiking, fishing, swimming, or cooking by a warm fire, each of them is fun. I live approximately 2 miles from fabulous Current River, which is fed by cold springs some 40 miles upstream. {#blank#}4{#/blank#}

I have no interest in hunting or party; I fancy simply sitting on a sand bar at dawn, watching the mist rise from the water. {#blank#}5{#/blank#} I listen for the beavers making splashes at night with their wide, flat tails. I hear coyotes howling at night too. I've seen cottonmouth snakes and even panther tracks! I love the serenity and the small thrills, the kinds of experiences I wouldn't trade for anything in the world.

A. I see and hear all kinds of wildlife.

B. But nature isn't just there for us to exploit.

C. Set up a place where you can stay comfortably.

D. If you're near a body of water, you can go swimming.

E. Become familiar with different trees and what they offer.

F. If you can accept nature as it is, it can work in your favor.

G. The river stays cool pretty much year-round and is refreshing in summer.