I am peter Hodes ,a volunteer stem courier. Since March 2012, I've done 89 trips of those , 51 have been abroad, I have 42 hours to carry stem cells（干细胞）in my little box because I've got two ice packs and that's how long they last, in all, from the time the stem cells are harvested from a donor(捐献者) to the time they can be implanted in the patient, we've got 72 hours at most, So I am always conscious of time.

I had one trip last year where I was caught by a hurricane in America. I picked up the stem cells in Providence, Rhode Island, and was meant to fly to Washington then back to London. But when I arrived at the check-in desk at Providence, the lady on the desk said: “Well, I'm really sorry, I've got some bad news for you-there are no fights from Washington.” So I took my box and put it on the desk and I said: “In this box are some stem cells that are urgently needed for a patient-please, please, you've got to get me back to the United Kingdom.” She just dropped everything. She arranged for a flight on a small plane to be held for mere-routed(改道)me through Newark and got me back to the UK even earlier than originally scheduled.

For thiscourier job, you're consciously aware than that box you're got something that is potentially going to save somebody's life.

    Most people agree that honesty is a good thing. But does Mother Nature agree? Animals can't talk, but can they lie in other ways? Can they lie with their bodies and behavior? Animal experts may not call it lying, but they do agree that many animals, from birds to chimpanzees, behave dishonestly to fool other animals. Why? Dishonesty often helps them survive.

    Many kinds of birds are very successful at fooling other animals. For example, a bird called the plover sometimes pretends to be hurt in order to protect its young. When a predator（猎食动物）gets close to its nest, the plover leads the predator away from the nest. How? It pretends to have a broken wing. The predator follows the “hurt” adult, leaving the baby birds safe in the nest.

  Another kind of bird, the scrub jay, buries its food so it always has something to eat. Scrub jays are also thieves. They watch where others bury their food and steal it. But clever scrub jays seem to know when a thief is watching them. So they go back later, unbury the food, and bury it again somewhere else.

    Birds called cuckoos have found a way to have babies without doing much work. How? They don't make nests. Instead, they get into other birds' nests secretly. Then they lay their eggs and fly away. When the baby birds come out, their adoptive parents feed them.

    Chimpanzees, or chimps, can also be sneaky. After a fight, the losing chimp will give its hand to the other. When the winning chimp puts out its hand, too, the chimps are friendly again. But an animal expert once saw a losing chimp take the winner's hand and start fighting again.

    Chimps are sneaky in other ways, too. When chimps find food that they love, such as bananas, it is natural for them to cry out. Then other chimps come running. But some clever chimps learn to cry very softly when they find food. That way, other chimps don't hear them, and they don't need to share their food.

    As children, many of us learn the saying “You can't fool Mother Nature.” But maybe you can't trust her, either.

    Yellowstone Vacations Calendar & Events

    Plan Your Day at Yellowstone

    When you visit Yellowstone National Park, just stepping outside presents an entire world of things to do. But if you're looking for something more structured, we offer our own brand of fun and adventure. Check below for upcoming events and start planning your day-to-day stay here at Yellowstone.

    Super Party at Holiday Inn West Yellowstone February 4

    Will you be in West Yellowstone on Sunday, February 4? Well, great news! We have no intention of missing the biggest game of the year, and we will be celebrating in true “big game” fashion at the Holiday Inn West Yellowstone. Join us as we broadcast the big game on our BIG screen in the conference space, and come and cheer for the team of your choice! A range of food and beverage specials will be available, including buckets of beer, Buffalo chicken clip, and of course wings. We hope to see you here on February 4, 2018!

     Kids'N'Snow Weekend March 3-4

    Don't miss a special weekend in West Yellowstone filled with fun activities for kids (and families) both outdoors and inside. Join the fun at the West Yellowstone Ice Rink,(溜冰场). Warm up with hot beverages, toast, some marshmallows, sled on the sledding hill. Bring your own sled for the Kid's Sledding Hill. Or, try out West Yellowstone's ice skating rink. A limited number of ice skates will be available at no charge (come early for the best selection). Relax with music and conversation. It's old-fashioned family fun for everyone of every age. All Yellowstone visitors are welcome!

    For full details and schedule information, please visit the official Kids'N'Snow website.

    Yellowstone Snowmobile Tours

    Call 800-426-7669 today to make a reservation.

    Looking for something a little more hands on? Take one of our Yellowstone Snowmobile Tours and let our local guides take you through the impressive winter wonderland!

    Custom and daily tours available.

    Snowmobile and Tour： $219 which does not include tax of 3%, lunch, clothing, park entrance fees.

    Yellowstone National Park and Rendezvous Snowmobile Rentals, require a valid drivers license to drive a snowmobile.

    For more information on rentals, please see our Snowmobile Rentals page and Frequently Asked Questions page.

    What is eBay? The simple answer is that it is a global trading platform where nearly anyone can trade practically anything. People can sell and buy all kinds of products and goods, including cars, movies and DVDs. sporting goods, travel tickets, musical instrument clothes and shoes- the list goes on and on.

    The idea came from Peter Omidyar, who was born in Paris and move to Washington when he was still a child. At high school, he became very interested in computer monogramming and after graduating from Tuft University in 1988, he worked for the next few years as a computer engineer. In his free time he started eBay as a kind of hobby, at first offering the service free by word of mouth.By1996 there was so much traffic on the website that he had to upgrade (升级) and he began charging a fee to members Joined by a friend, Peter Skoll, and in 1998 by his capable CEO, Meg Whitman, he has never looked back. Even in the crashes of the late 1990s, eBay has gone from strength to strength. It is now one of the ten most visited online shopping websites on the internet.

    eBay sells connections, not goods, putting buyer and seller into contact with each other. All you have to do is take an e-photo, write a description fill out a sales form and you are in business; the world is your market place. Of course for each item (商品) sold eBay gets a percentage and that is a great deal of money. Every day there are more than sixteen million items listed on eBay and eighty percent of the items are sold……

    After moving to the United States, immigrant groups trying to fit in tend to choose high calorie fatty foods in an attempt to appear more American, a new study finds. That's one reason why immigrants approach US levels of obesity within 15 years of moving to America.

The researchers also did an experiment that measured whether or not the threat of appearing un-American influenced respondents' food choices. After being questioned about their ability to speak English 75 percent of Asian-Americans identified a typical American food as their favorite. Only 25 percent of Asian-Americans who had not been asked if they spoke English did the same.

    When their American identity was called into question during a follow-up study, Asian-American participants also tended to choose typical American dishes, such as hamburgers and cheese sandwiches.  In that experiment, 55 Asian-Americans were asked to choose a meal from a local Asian or American restaurant. Some participants were told that only Americans could participate in the study. Those who chose the more typical American fare ended up consuming an extra 182 calories,  including 12 grams of fat and 7 grams of saturated fat (饱和脂肪).

    "People who feel like they need to prove they belong to a culture will change their habits in an attempt to fit in," said Sauna Cheryan, an author of the study and assistant professor of psychology at the University of Washington.

    "If immigrants and their children choose unhealthy American foods over healthier traditional foods across their lives, this process of fitting in could lead to poorer health." Cheryan added.

    Social pressures, the study concluded, are at the heart of the problem.  "In American society today, being American is associated with being white. Americans, who don't fit this image even if they were born here and speak English, feel that pressure to prove that they're American," said Cheryan.

    On a sunny, spring day, a group of children, four to seven years old, sit on their bicycles. They wear helmets to protect their heads and gloves to protect their hands. Their mothers, standing nearby, watch them closely. The children are ready to learn how to ride. Rachel Varn still remembers how she felt riding a bicycle for the first time. She says, "It is probably the biggest confidence booster (提升). It gives kids such a sense of independence and self-guidance." Now, her job is helping children experience that moment.

    Rachel Varn left her job of selling bicycles to become a trainer for bicycle riding last year. She founded Pedal Power Kids to teach bicycle education. Before starting a ride she teaches the children how to make sure the bicycles are in good condition for safe use. She calls it " the ABC quick check." "A" is for air. she explains, "We have to check out tires before we ride. "B" is for brakes. We want to make sure our brakes work before we find ourselves at the top of a hill about to go down. And "C" is for chain." She says the chain must be clean.

    The rest of the training is more fun. The children learn riding skills, from balance and pedaling to turning, starting and stopping. And they learn to keep their eyes up and look ahead while riding. Varn says many children struggle to do this. They look down at the pedals instead. She adds, " Obviously that doesn't allow them to see what's going on around them, and it doesn't allow them to turn properly either." Varn says watching where you are going helps you turn easier.

    Learning to ride a bicycle can open a whole new world to children. It gives them a sense of accomplishment and freedom. They become more sensitive to their surroundings and better able to make safe, smart decisions going from one place to another. Varn's goal is to get more children on two wheels. She says," That's really a great way for kids to be active and develop healthy habits. It helps reduce pollution and just keep families and communities connected."