Laozi or Lao Tzu, who lived in the 6th century BC, was a well-known philosopher in ancient China. He was the founder of Taoism. His teachings have been passed down through centuries and today there are still many followers of Taoism.

    Famous and respected as he is. Laozi's personal life is still a mystery and there are many stories about his birth and life. The only reliable biography of him is Shiji written by historian Sima Qian of 145 BC. According to Shiji, Laozi was born in Ku County of the state of Chu, the present day Luyi County of Henan Province. His family name was "Li", and "Dan" was his designation (字).

    At first, Laozi worked as a historian at the royal court (王朝) of the Zhou Dynasty. Later, he went on a trip to the west and met the guardian of the Hangu Pass (函谷关) who asked Laozi to write a book to record his wisdom for the good of the country.

    Upon his request, Laozi began writing his famous book—Daodejing. Daode means "virtue". So the title can be translated as "Classic of the Virtue". After finishing writing the book, the wise old man left Hangu Pass. No one had seen him or known where he was ever since.

    However, because of the fact that none of the original texts about Taoism have any reference about the life and death of Laozi, today many researchers have the opinion that Daodejing was in fact not written by Laozi alone. Some even say that Laozi was never a real person but can be referred to any old wise man in ancient China who taught philosophy.

    Beautysleep is a real thing, researches have shown that people who have enough sleeplook more attractive (有魅力的) to others.

    A few badnights are enough to make a person look especially "more ugly", theirsleep experiments show.

    Theresearchers asked 25 university students to join in their sleep experiment.They were asked to get a good night's sleep for two nights.

    A weeklater, they were asked to sleep for only four hour every night for two nightsin a row. The researchers took make—up free (素颜) photos of the volunteers afterboth the good and the bad sleep.

    Next, theyasked 122 strangers to have a look at the photos and judge (评价) them on attractiveness, health,and sleepiness, as well as asking them: "How much would you like to makefriends with this person in the picture?"

    Thestrangers were good at judging whether the person they were looking at wastired, and if he was sleepy, his attractiveness score would be low.

    Thestrangers also said they wouldn't want tosocialize with the tiredstudents. The researchers say this is natural for people. An unhealthy-lookingface makes people run away. In other words, people don't want to hang aroundwith people who might be ill.

    Dr Brewer,an expert at the University of Liverpool said: "Judgment of attractivenessis often unconscious (无意识的), but we all do it, and we are able to judge on even somethingsmall like whether someone looks tired or unhealthy. This study is a goodreminder of how important sleep is to us."

You can get used to heat. You can train for the hot weather. Going somewhere hot? Some {#blank#}1{#/blank#} recommend an hour outside every day, leading up to it.

They suggest other methods to help {#blank#}2{#/blank#} heat illness. Avoid heavy exercise in the middle of the day. The sun's rays cause your skin to darken. Wear loose, lightweight clothing. Cover up with clothes. It can {#blank#}3{#/blank#} your skin like sunscreen does.

It's important to stay hydrated (含水的). Drink lots of water, {#blank#}4{#/blank#} when you're sweating.

We lose electrolytes (电解质) in sweat. Look for drinks that replace them. If you are outside, find some shade. And always go inside if you are feeling too hot. Following these tips will help you enjoy your summer safely.

Bob's Family Tree