Can exercise during childhood protect you against memory loss many decades later? Exercise early in life seems to have lifelong benefits for the brain, in rats at least.

    “This is an animal study, but it shows that physical activity at a young age is very important—not just for physical development, but for the whole lifelong track of cognitive (认知的) development during ageing,” says Martin Wojtowicz of the University of Toronto, Canada. “In humans, it may delay the appearance of Alzheimer's symptoms (阿兹海默氏症), possibly to the point of preventing them.”

    Wojtowicz's team divided 80 young male rats into two equal groups, and placed running wheels in the cages of one group for a period of six weeks. Around four months later-when the rats had reached middle age-the team taught all the rats to connect an electric shock with being in a specific box. When placed in the box, they froze with fear.

    Two weeks later, the team tested the rats in three situations: exactly the same box in the same room, the same box with the room arranged differently, and a completely different box in a different room.

    The rats without access to a running wheel when they were young now froze the same percentage of times in each of these situations, suggesting they couldn't remember which one was dangerous. But those that had been able to run in their youth froze 40 to 50 percent less in both changed box settings.

    “The results suggest the amount of physical activity when we're young, at least for rats, has influence on brain and cognitive health-in the form of better memories-when we're older,” says Arthur Kramer of Northeastern University in Boston, who has found that, in humans, exercise promotes the growth of new brain cells.

    If you're dreaming of visiting one of those picture-perfect European towns filled with old-world attractiveness and scenic beauty, here is a look at the most beautiful small towns in Europe.

    Manarola

    Manarola, Italy, is filled with rainbow-colored homes carved right into a wall of stone along the Mediterranean coast. This charming fishing town is famous for its unbelievable wine, and the paintings. There are no cars here, no traffic lights, or traffic noise. You can drive to Manarola, but you'll have to park just outside the town and then take a shuttle bus or walk in on foot.

    Garmisch-Partenkirchen

    Garmisch-Partenkirchen, Germany, is a fascinating mountain town. Once two separate towns, one Roman and the other Teutonic, the 1936 Winter Olympics forced them to combine, though the two sides still have different characters. The town dates back to 15 AD, filled with narrow, cobblestoned streets lined with historic three or four-story buildings painted with regional and religious scenes.

    Marsaxlokk

    The energetic trading port of Marsaxlokk, Malta, was built in 900 BC. Today, this pictures-like town is the main supplier of fish to the island nation that sits in the Mediterranean Sea. It has no modern buildings to ruin its appeal. With such quiet surroundings, including the traditional luzzu's (fishing boats), it's a particularly charming place to visit.

    Portmagee, Ireland

    In a country filled with beautiful towns, Portmagee, is a standout, sitting on the southwest coast of Ireland. This postcard-perfect seaside fishing town has a row of brightly colored buildings along with a rich and colorful history. At The Bridge Bar, you'll find live music many nights of the week along with fantastic food and a fine glass of beer.

    Personal computers and the Internet give people new choices about how to spend their time.

    Some may use this freedom to share less time with certain friends or family members, but new technology will also let them stay in closer touch with those they care most about. I know this from personal experience.

    E-mail makes it easy to work at home, which is where I now spend most weekends and evenings. My working hours aren't necessarily much shorter than they once were but I spend fewer of them at the office. This lets me share more time with my young daughter than I might have if she'd been born before electronic mail became such a practical tool.

    The Internet also makes it easy to share thoughts with a group of friends. Say you do something fun, see a great movie perhaps-and there are four or five friends who might want to hear about it. If you call each one, you may tire of telling the story.

    With E-mail, you just write one note about your experience, at your convenience, and address it to all the friends you think might be interested. They can read your message when they have time, and read only as much as they want to. They can reply at their convenience, and you can read what they have to say at your convenience.

    E-mail is also an inexpensive way stay in close touch with people who live far away. More than a few parents use E-mail to keep in touch, even daily touch, with their children off at college.

    We just have to keep in mind that computers and the Internet offer another way of staying in touch. They don't take the place of any of the old ways.

    Family Fun in Canadian Museum of Nature

    Bring the whole family to rediscover our fully redecorated museum.

    WHAT TO SEE AND DO

    Check out What's On for all the events, educational activities and HD movies happening during your visit. Care for birds, dive down into the depths at the helm (舵柄) of a research submersible(潜水器) or explore a cave… on the first floor. Don't miss our gallery play areas on the third floor when visiting with kids. By visiting here, your children will learn more about nature. Check out Our Exhibitions which presents our special exhibitions and our galleries. Be sure to stop at our Nature Boutique on the second floor for a vast selection of games, books and nature-related souvenirs from 9:30 am until the museum closes for the day.

    HOURS, ADMISSION, SERVICES AND MORE

    The Canadian Museum of Nature provides a lot of information, images and videos on our websites about nature, such as http://www.nature.ca/en/family-fun and http://www.expeditionarctic.ca/. The museum also participates in several social networks. Follow us on Facebook, YouTube, Instagram and Twitter.

    Many of us have had this experience: we lie down in a bed other than our own, perhaps at a friend's house or in a hotel room, and find it difficult or impossible to fall asleep. Is it because the bed is uncomfortable? Maybe, but perhaps there can be other reasons.

    According to a new study published in Current Biology, a significant reason is what the scientists call "first night effect". They believe that one side of the brain acts as a "night watch" to warn us about potential dangers. It forces us to stay awake on the first night in a new environments.

    For the study, 35 young volunteers were asked to sleep in a sleep lab for several days. Meanwhile, researchers watched their brain activities.

    According to the researchers, on their first night, the left brain was more active than the right brain and people had a hard time sleeping. However, left-brain activities decreased as days went by, falling even to the point of complete calm. In this process, the participants got an increasingly better sleep experience.

    The findings suggest that the different rhythms of the sides of the brain affect our sleep. When the two sides work differently, the balance between them is broken. Thus, the brain can't relax and is sensitive to anything strange in the surroundings, just as it is in the daytime.

    "At some level, the brain is continuing to analyze things, even though you are not aware of the analysis, " US professor Jerome Siegel told Smithsonian

    "If something unusual happens - if a door opens or you hear a key in a lock --you can be alert, even though the intensity of the stimulus (刺激强度) is quite low." More surprisingly, this phenomenon is similar to the way some animals sleep.

    The researchers think that it is the result of evolution (进化), and works to protect us in potentially dangerous environments.

    If you have ever had what you think is "first night effect", researchers suggest that you bring your own pillow or sleep in a room similar to your bedroom next time you sleep away from home.