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A strong memory depends 1 the health and vitality(»îÁ¦)of your brain. Humans are 2 (high) social animals, so relationships stimulate(´Ì¼¤)our brains ¡ª in fact, interacting with 3 may be the best brain exercise.

Having 4 (mean) relationships is not only vital to emotional health, but also to brain health. In one recent study from the Harvard School of Public Health, for example, researchers found that people with the most active social life had the 5 (slow) rate of memory deterioration.

And moreover, you¡¯ve heard that laughter is the best medicine for the brain as 6 £¨good£© as the body. As psychologist Daniel 7 (note)in his book Emotional Intelligence, £¢Laughter seems to help people think more broadly and associate more freely.£¢

When you hear laughter, move toward it. Most of the time, people are very happy 8 (share) something funny because it gives them an opportunity to laugh together.

Please spend time with those who laugh ___9___(easy) ¡ª both at themselves and at life¡¯s humorous events. Surround yourself with reminders to lighten up. Keep 10 toy on your desk or in your car. Put up a funny poster in your office. Choose a computer screen saver that makes you laugh.

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Someone asks me what on earth happiness means? I can¡¯t give you the exact definition of it, but I¡¯m sure if you love and help others, you¡¯ll get it.

I¡¯ll never forget an old lady 1 lives in a small house alone. It¡¯s said that her husband and her son 2 (die) in a traffic accident. How bitter her life is! But the old lady often helps others 3 a smile. Whenever it snows, she is always the first 4 (clean )the paths. She looks after several children living nearby. I am one of them. I often remember the stories she told us and her kind smile. Perhaps she is unlucky, 5 I think she is a happy person.

Her life is full of laughter and love.

But I¡¯m sad to see some people getting their happiness in bad way. They speak loudly in cinemas and meeting rooms; they destroy trees to enjoy 6 (they) and they laugh at others¡¯ 7 (shortcoming). Perhaps they feel happy at that time, but they will never get happiness 8 (true) because they have lost their personalities. Now I know 9 happiness is. It means kindness, love and unselfishness. Above all, only 10 (bring) happiness to others can make you get it.

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A new phone app uses vibrations from smartphones to alert people about earthquakes. 1 phone app recognizes sudden shaking of the earth¡¯s surface through sensors in smartphones.

The new app is called MyShake. It is the work of four 2 (research) at the University of California, Berkeley. They said they created a worldwide warning system 3 would inform people and give them time to prepare. Other earthquake apps include QuakeFeed, Quakes and Earthquake. They show 4 earthquakes have happened, at what strength, and the aftershocks. Those use data from the U.S. Geological Survey.

Smartphones 5 (equip) with accelerometers(¼ÓËÙ¼Æ). These instruments measure movement, like that of a car or airplane. 6 (probable), they can also measure the shaking of a machine, a building or other structures. Accelerometers are used in activity trackers and apps that count steps or other exercise. They also are used in global positioning system apps, also 7 (call) GPS.

MyShake uses phone accelerometers to measure seismic(µØÕðµÄ) activity. It has been designed 8 (know) the difference between normal activity and earthquake movement. The software developers say their app is right 93 percent of the time.

A smartphone sends seismic 9 (inform) to the app developers. If the developers receive several warnings from one area, it recognizes that an earthquake may be taking place 10 will take place soon.

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