Opened in 1847, the London Zoo is the world's oldest scientific zoo. Today it houses over 760 different species of animal and is the only zoo in London where you can experience big animals.

    Explore the “Into Africa” exhibit (展览) where you can come face to face with some of Africa's most unusual animals including hunting dogs, or try “Meet The Monkeys” an exciting walk-through experience. Other top exhibits include the Butterfly Paradise, where you can enjoy many species of butterfly as they fly around you.

    Make sure you don't miss feeding time at the Penguin Beach and find out more about these popular creatures from the zoo's experienced keepers. Penguin Beach, with a very large pool and underwater viewing areas, allows visitors to be close to the penguins like never before.

    Built in 2013, Tiger Territory is a great experience taking visitors deep into the world of these wonderful creatures.

    Rainforest Life is London's only living rainforest, where visitors can meet a variety of beautiful rainforest species including. In the all-new “Night Life” area you will discover the bats, and rats.

    With over 12,000 animals to see and incredible animal displays taking place throughout the day (including feeds and keeper talks), no visitor leaves disappointed. Learn more about London Zoo in our Interview with a Zoo Keeper on our London Pass Blog.

    You can visit the London Zoo for free with a London Pass—a fantastic saving of £23 for adults and over £16 for children. Children aged 3-4 will be charged on entrance fee for London Zoo.

    For centuries, people wondered how big the Earth was. Unfortunately, although the Earth was flat, no one was able to figure out its size. Gradually, however, people began to realize that the Earth was really round.

    Then, in the third century BC(2,300 years ago), a Greek man named Eratosthenes had an idea. Eratosthenes was sure that the Earth was a sphere. He used the sun and geometry(几何学) to figure out the size of the Earth. He calculated that the circumference(圆周) of the Earth was 28,600 miles(46,000 kilometers). The true size of the Earth is 25,000 miles(40,000 kilometers).

    Eratosthenes' measurement was wrong, but it was very close to the truth.

    For many centuries after Eratoshenes lived, people made maps of the Earth. However, they did not know very much about the world outside of Europe, Asia, and North Africa. Mapmakers could not draw accurate maps of the Earth until people began traveling around the world in the fifteenth century, mapping small areas each time. In the eighteenth and nineteenth centuries, people began making correct maps of countries, but the first accurate maps of the world were not made until the 1890s.

    Maps today are reliable(可依靠的), inexpensive, and easy to understand. People depend on maps every day. What would our lives be like without them?

    Our most important institutions, our schools and our workplaces, are designed mostly for extroverts (性格外向者).

In the typical classroom, students are often divided into groups—four or five or more kids all facing each other. And kids are working on countless group assignments. Even in subjects like math and creative writing, which you think would depend on unaccompanied flights of thought, kids are now expected to act as committee members. As for the kids who prefer to go off by themselves or just to work alone, those kids are seen as outliers (局外人) often or, worse, as problem cases. And the vast majority of teachers believe that the ideal student is an extrovert as opposed to an introvert (性格内向者), even though introverts actually get better grades and are more knowledgeable, according to research.

The same thing is true in our workplaces. Now, most of us work in open plan offices, without walls, where we are subject to the constant noise and stare of our coworkers. And when it comes to leadership, introverts are routinely passed over for leadership positions, even though introverts tend to be very careful, much less likely to take outsize risks —which is something we might all favor nowadays. And interesting research by Adam Grant at the Wharton School has found that introverted leaders often deliver better outcomes than extroverts do, because when they are managing thoughtful employees, they're much more likely to let those employees run with their ideas.

    In fact, some of our great leaders in history have been introverts. I'll give you some examples. Eleanor Roosevelt, Rosa Parks, Gandhi -- all these people described themselves as quiet and soft-spoken and even shy. However, they all took the spotlight, even though every bone in their bodies was telling them not to. And this turns out to have a special power, because people could feel that these leaders were in control, not because they enjoyed directing others and not out of the pleasure of being looked at; they were there because they had no choice, because they were driven to do what they thought was right.

    Brazil, the largest country in South America, is famous for the Amazon rainforest and soccer. But on the hottest days, people travel there for another reason – the Carnival. Full of excitement and fun, the Carnival is held annually in February or March. This year, the celebration runs from March 2^nd to 9^th.

    It is a wild festival of food, music and dance. The word "Carnival" comes from the Portuguese "Carne Vale", which means "farewell to meat". In the early 1600s, the Portuguese brought European traditions to Brazil. Then they started their own carnival with dances and music, which were inspired by black people brought there by the slave trade.

    With its beautiful floats (花车), attractive clothes and happy people, the Samba Parade is the most fantastic event of the Carnival. The Sambadrome is a special stadium for the Carnival in Rio de Janeiro with 80,000 seats where people can sit and enjoy the festival. Samba is said to be the soul of Rio. "This is where the passion for samba lies – the atmosphere is electric as even the oldest men and women sing and dance to the music," travel guidebook Lonely Planet noted.

    Top samba schools stand out in the main parade, with fantastic parades of floats and thousands of dancers. The parade goes on until dawn. The schools base their performances on certain themes from Brazilian history or on social and environmental problems, such as that of the Amazon rainforest.

    Besides fun street parties, colorful costumes and energetic music, Carnival also offers plenty of tasty street food, such as Quindim – a dessert made of egg yolks and sugar.

Overall, it is traditionally a time to go a bit crazy with eating, dancing and dressing up.

    Memory, they say, is a matter of practice and exercise. If you have the wish and really make a conscious(自觉的) effort, then you can quite easily improve your ability to remember things. But even if you are successful, there are times when your memory seems to play tricks on you.

    Sometimes you remember things that really did not happen. One morning last week, for example, I got up and found that I had left the front door unlocked all night, yet I clearly remember locking it carefully the night before.

    Memory "tricks" work the other way as well. Once in a while you remember not doing something, and then find out that you did. One day last month, for example, I was sitting in a barber shop waiting for my turn to get a haircut, and suddenly I realized that I had got a haircut two days before at the barber shop across the street from my office.

    We always seem to find something funny and amusing in incidents caused by people's forgetfulness or absent-mindedness. Stories about absent-minded professors have been told for years, and we never get tired of hearing new ones. Unfortunately, however, absent-mindedness is not always funny. There are times when "tricks" of our memory can cause us great trouble.

    What do you want to be when you grow up? A teacher? A doctor? How about an ice-cream taster?

    Yes, there really is a job where you can get paid to taste ice cream. Just ask John Harrison, an "Official Taste Tester" for the past 21 years. Testing helps producers to be sure of a product's quality. During his career Harrison has been responsible for approving large quantities of the sweet ice cream –as well as for developing over 75 flavors(味道).

    Some people think that it would be easy to do this job; after all, you just have to like ice cream, right? No –-- there's more to the job than that, says Harrison, who has a degree in chemistry. He points out that a dairy or food-science degree would be very useful to someone wanting a career in this "cool" field.

    In a typical morning on the job, Harrison tastes and rates 60 ice-cream samples. He lets the ice cream warm up to about 12 F. Harrisonexplains, "You get more flavor from warmer ice cream, which is why some kids like to stir it, creating ice-cream soup."

    While the ice cream warms up, Harrison looks over the samples and grades each one on its appearance. "Tasting begins with the eyes," he explains. He checks to see if the ice cream is attractive and asks himself, "Does the product have the colour expected from that flavor?" Next it's time to taste!

    Continuing to think up new ideas, try out new flavors, and test samples from so many kinds of ice cream each day keeps Harrison busy but happy – working at once cool job.