Did you spend much time lying on the comfortable sofa at home during the summer vacation? How often did you do sports this summer? People across the world need to get moving, according to a new study by the World Health Organization (世界卫生组织).

    5% of adults do not get enough exercise, according to the study. This number hasn't changed from 2001. Because of this, about 1.4 billion people are close to deadly diseases (疾病) such as heart disease and cancer (癌症).

    People should do at least 2 and a half hours of "moderate intensity (中等强度)" exercise each week, such as dancing or swimming. They can also do 75 minutes of "vigorous intensity (高强度)" exercise, such as running or playing soccer, according to the WHO.

    As for how to exercise more, experts says that we don't have to go to the gym (健身房) every time For example, we can go up and down stairs (楼梯) a lot instead of taking the lift. If we can't go to a dancing class each week, standing on one leg for 30 seconds a day is very good too.

    The study also found that women are less active than men, 32% of women hardly ever take exercise, compared to (比较) 23% of men. Women spend more time at home taking care of children and doing housework.

    But unlike that in most other countries, men are less active than women in China, with 16.6% of men and 12% of women not getting enough exercise.

Here are four clothing stores.

Notes: £ means the cheapest; £ £ £ £ means the most expensive;

★ means friendly; ★★★★ means the friendliest

    Grandparents are respected in many human societies. But telling stories about old times and overfeeding grandchildren seem like human qualities. Are these classic grandparent behaviors really limited to humans?

Do any animals know their grandparents the way people do?

For most species on Earth, the answer is certainly " No" . " Usually, there aren't grandparents around anymore when an animal is born,"  said Mirkka Lahdenpera, a biologist at the University of Turku in Finland. " Even if an animal's life span does overlap (重叠) with its grandparents', most species spread out to avoid competing for resources, so the chance of running into a grandparent is slim." 

But there are a few clear exceptions, primarily among mammals (哺乳动物) that live in close social groups. In troops of langur monkeys in India, older females lived together with their daughters and grandchildren. The grandmother langurs defend the group's babies against attacks and even give their own grandchildren special treatment.

Many whale species, too, travel in family groups that include both grandmothers and grandchildren.

Elephant herds are also famously matriarchal. They are led by a grandmother, who can live to around 80 years old, and are generally made up of her daughters and their young. The females in a herd form close bonds and work together to raise their young.

Lahdenper found that the babies of young mothers were eight times more likely to survive if their grandmothers lived near them than if they didn't. When the young mothers were older and more experienced at raising babies, this beneficial grandmother effect disappeared even if the actual grandmothers were still around.

Indeed, most evidence for the benefits of grand parenting comes from mammals. But in 2010, researchers found that in troops of insects called gall-forming aphids, older females defend their relatives after they've stopped reproducing (繁殖).

And what about grandfathers? Studies of humans in recent decades have shown that a living grandfather can improve a person's mental health and other indicators of well-being. But there's no evidence of that in the animal kingdom. Male animals rarely socialize with their own children, let alone any grandchildren.

Children all around the world love Lego bricks(乐高积木). With those bricks, they can make anything they want. Lego bricks are a great toy(玩具) to play with. Now, for the first time, Lego makes Braille Bricks in English and French, making them a useful toy for blind(失明的) children. 

Lego Braille Bricks have dots (小圆点) on them. The dots are Braille. By feeling (感受) them, blind children can read words and numbers. They can also learn Braille when playing with the bricks. It makes learning easy and fun. 

Olivia is a blind girl, and she learns Braille when playing with the Lego bricks at her school. She loves to play with them and learn Braille at the same time. Her mother also plays with her at home and now she also knows Braille. 

Reece, a little boy, uses the Lego bricks to teach his family Braille. Now, his mother and sister know Braille as well. He says, "I feel so good. Because my loved ones learn something new and I am their teacher. So cool!"

Lego makes its colourful bricks useful. Let's thank it for bringing a new way of playing and learning!

Zhou Dao's grandfather has a hearing problem. During a family party last year, Zhou Dao noticed something. His grandfather sat quietly by himself. The old man was unable to join the talks.

Zhou Dao was sad about this. "Grandpa always reads subtitles (字幕) to watch TV," he thought. "Why can't we put words on our talks?" Then, Zhou Dao began working on that idea. He spent about half a year developing a kind of smart glasses. These smart glasses help users "read" spoken words.

The glasses are connected to a smartphone. There is a microphone on the glasses. It records audio (录制音频) and sends it to the phone. A piece of software turns the audio into words. People can see the words on the glasses.

This allows users with hearing problems to understand others during the talks well. Now Zhou Dao's grandfather can wear the glasses and speak to someone else face to face or over the phone.

Zhou Dao was happy to help his grandfather. Slowly, more and more people in need can wear this kind of glasses.