While serious training is important for all dogs, playtime is just as important.{#blank#}1{#/blank#} Use these games to help teach your dog how to play.

1）Hide and Seek

    Hide and seek isn't just for kids. Dogs can really enjoy this game. Pick up one of your dog's favorite toys or treats. Tell your dog to stay.{#blank#}2{#/blank#} When you are ready, call your dog to come to you. If possible, squeak(使吱吱叫)the toy or shake the treats. Reward your dog with praise and the toy/treat when she finds you.

2）Fetch

    Many dogs have a natural ability to fetch. Other dogs can be taught how.{#blank#}3{#/blank#}Play indoors with a soft toy or outdoors in a fenced-in area with a ball or disc. For dogs that really  love to run, try this game of fetch!

3）Find the Treat

    Dogs have superior senses of smell, and most love to use their noses to find food. Let your dog use her brain and her nose to find hidden goodies. First, have your dog stay out of sight. Then, hide her favorite treats in various places around the room.{#blank#}4{#/blank#} If help is needed, you can lead her around or point to areas for her to explore.

    Whatever the game, safety comes first! Remember to watch your dog for signs of exhaustion or overheating when you are playing. Stop if your dog seems tired or shows signs of anxiety. {#blank#}5{#/blank#}When other dogs or people are around, it may create a dangerous distraction(分神).

A. Then, go to find a good hiding place.

B. Try different games to see which your dog responds to best.

C. A good game of fetch can be played almost anywhere.

D. You can include games in training as well.

E. Also be aware of your surroundings when playing with your dog.

F. Encourage your dog to play with other dogs.

G. Bring your dog back in and tell her to “go find!”

    Can animals be artistic? Painting and music are part of efforts to keep animals happy at the Smithsonian's National Zoo.

    A sloth bear (长毛熊) called Francois is one of the National Zoo's artists. He began his artistic career two years ago. Francois has a very unusual way to paint. He uses his breathing to paint. His zookeeper, Stacey Tabellario, says that although the technique may look strange, it is actually a very natural behavior for sloth bears. The zookeepers fill one of those tubes full of paint and ask them to breathe through it. And they blow all of the paints onto the canvases (画布), making these really cool paintings.

    Animal artists come in all shapes and sizes at the Zoo. They use many kinds of techniques to create their works of art. Apes use paintbrushes. Many use their paws or claws—much like a human painter who would use his or her hands.

    Stacey Tabellario says Francois seems to enjoy expressing himself through his art. “When I set up the materials for painting activity, he comes and sits next to them and waits until they are ready for painting. He does that every time. I also see where his eyes go. He does see the paints come out of the tube and land on the canvas.”

    But not every animal wants to paint. Music is another part of the arts enrichment program. Physically and mentally stimulating activities are an important part of the daily care of the animals. Trainers have a lot of tools, from tablet computer to small toys.

    Kenton Kerns says the program helps the animals and the zookeepers in many ways. Every interaction between keepers and their animals creates some sort of connections. The one-of-a-kind works of art created by the animals are popular with zoo visitors. Many are sold at the zoo's fund-raising events.

    Trip 1 Black Bear Count

    There have been fires in this area in the last few years and the Office of the National Park is not sure how many black bears are still living. Some bears have been seen since the fires, and the office has asked for young people to help count them. The entire trip will last three hours. Booking is necessary.

    Cost: Free                   When: May 8

    Trip 2 Garland Valley

    Bring your drink and lunch for this walk in a beautiful area of the Blue Mountains. Garland Valley is close to the town of Garland but is part of the National Park. Many wild animals live in this area, including many rare birds. This is a great walk for bird-lovers. The trip lasts four hours. Booking is necessary.

    Cost: $ 15                  When: May 8, May 15

    Trip 3 Flashlight Adventure

    Put on your warm clothes, bring a flashlight and a pair of glasses, and come for a night walk along the Dungog Valley. A guide will lead the tour. You will see many of the animals on this trip. The guide will tell you about the lives of the animals you see. Numbers are strictly limited on night trips, so be sure to book early. This walk lasts two and a half hours.

    Cost: $ 12                  When: May 8, May 15, May 22

    Equipment to be needed:

    Please bring enough water and food for all walks

Wear good walking shoes—no high heels.

    Wear a hat for day walks.

    Dress warmly for night walks.

    Children must be with an adult.

    Make sure your flashlight works well and bring extra batteries for night walks.

    Follow all instructions from guides during the walks. The mountains are a dangerous place.

    Bookings:

Booking for the above trips can be made by telephone (893—4847) or on the Internet at www.Bluemountaintour.com.

    We all think plants were expected to get larger with increased carbon dioxide in the atmosphere, but changes in temperature, humidity(湿度)and nutrient availability seem to have trumped the benefits of increased carbon dioxide" said researchers from the National University of Singapore.

    45 percent of the species studied now reach smaller adult sizes than they did in the past. The researchers pointed out that warmer temperatures and changing habitats, caused by climate change, are possible reasons for shrinking creatures.

    " We do not yet know the mechanisms(机制)involved, or why some organism are getting smaller while others are unaffected," the researchers said. "Until we understand more, we could be risking negative consequences that we can't yet quantify."

    The change is big in cold-blooded animals. Only two decades of warmer temperatures are enough to make retiles (爬行动物)smaller. An increase of only 1 degree centigrade caused nearly a 10 percent increase in metabolism(新陈代谢). Greater use of energy resulted in tiny tortoises and little lizards. Fish are smaller now too. Though overfishing has played a part in reducing numbers, experiments show that warmer temperatures also stop fish growing.

    Warm-blooded animals aren't immune(免除)from the size change caused by climate change. Many birds are now smaller. Soay sheep are thinner. Red deer are weaken And polar bears are smaller, compared with historical records.

    This is not the first time this has happened in Earth's history. 55 million years ago, a warming event similar to the current climate change caused bees, spiders and ants to shrink by 50 to 75 percent over several thousand years. That event happened over a longer time than the current climate change.

    The speed of modem climate change could mean organisms may not respond or adapt quickly enough, especially those with long generation times climate change will be shown in the future.

    Crossing your legs is an extremely common habit; most people don't even notice that they're doing it when they sit down. While you may find it comfortable to sit with one knee crossed over the other, it might be causing health problems that you are not aware of.

    A study published in Blood Pressure Monitoring stated that sitting with your legs crossed can increase your blood pressure. The reason this happens is because the blood in your legs has to work against gravity to be pumped back to your heart, crossing one leg over the other increases resistance, making it even harder for the blood to circulate. This causes your body to increase your blood pressure to push the blood back to the heart. You won't feel any immediate effects, but if you sit for long periods of time it's important that you take note of how long you have your legs crossed for. You shouldn't have your legs crossed for more than 15 minutes, and it's important that you get up and walk around at least once every hour.

    Crossing your legs can also lead to neck and back pain. Ideally, it's best for our bodies to sit with our feet planted flat, hip width apart, on the floor, but it's not easy to maintain perfect posture all day at the office.

    You also might notice that when you sit with your legs crossed for long periods of time your feet and legs get tingly(刺痛的) or have the feeling of being asleep. While the feeling of discomfort may only last a minute or two, repeatedly crossing your legs until they feel numb can cause permanent nerve damage.

    So next time you sit down, try to get yourself in the habit of sitting with both of your feet on the floor. Not only will it help your posture and stability, but it will also save your health in the long run.

    Mid-afternoon on a particularly busy Tuesday, I took leave of my desk at work and walked into a local Starbucks, only to find a space where neither my clients (客户) nor my children would ask me to do something.

    Inside, I ran into Kate, a co-worker of mine. The topic of parenthood came up. I complained about how packed my schedule was. From the minute I woke up to the minute I fell asleep, I was constantly in demand and always had someone knocking at the door. But a bit of sadness seemed to come over Kate's face.

    "Well, my daughter's in San Francisco and she doesn't seem to need me at all these days." Kate said. It was in that moment that I realized although I might often feel in high demand, there will come a day when I'll actually miss that same stress I now complain about.

    And as our conversation continued, it turned to our children's younger years, with Kate smiling proudly, thinking of the little boy and girl she raised who are now a man and a woman. But I noticed her smile was marked with regret. She explained that she often wondered about what she could have done differently when her children were in their earlier years.

    This got me thinking Is regret an unfortunate footnote (注脚) to parenthood? With that in mind, I asked six older parents one question: What is your biggest regret from your early days as a parent?

    It turned out that all of them thought they could have done it better. But, each of them also has a strong, healthy relationship with their kids. Whatever regrets their parents might have had about their upbringing, one thing is clear—it didn't affect them in a meaningful way.

    The bottom line is, we all feel like we could be doing this parenting thing better, And quite clearly, years later, we're still going to look back and wish we tried things differently. But the past can't be changed, and neither should it.