Ever wonder how much a cloud weighs? What about a hurricane? A meteorologist（气象学家） has done some estimates and the results might surprise you.

    Let's start with a very simple white puffy cloud—a cumulus cloud(积云). How much does the water in a cumulus cloud weigh? Peggy LeMone, senior scientist at the National Center for Atmospheric Research in Boulder, Colorado, did the numbers. “The water in the little cloud weighs about 550 tons,” she calculates. “Or if you want to convert it to something that might be a little more meaningful...think of elephants.” Assume（假设） an elephant weighs about six tons, she says, that would mean the water inside a typical cumulus cloud would weigh about one hundred elephants.

    The thought of a hundred elephants' worth of water floating in the sky begs another question—what keeps it up there?

    “First of all, the water isn't in elephant-sized particles(微粒); it's in tiny tiny tiny particles,” explains LeMone. And those particles float on the warmer air that's rising below. But still, the concept of so much water floating in the sky was surprising even to a meteorologist like LeMone. “I had no idea how much a cloud would weigh, actually, when I started the calculations（计算）,” she says.

    So how many elephant units of water are inside a big storm cloud—10 times bigger all the way around than the “puffy” cumulus cloud? Again, LeMone did the numbers: About 200,000 elephants.

    Now, come to the calculations for a hurricane about the size of Missouri and the figures get really massive. “What we're doing is weighing the water in one cubic meter theoretically pulled from a cloud and then multiplying by the number of meters in a whole hurricane,” she explains.

    The result? Forty million elephants. That means the water in one hurricane weighs more than all the elephants on the planet. Perhaps even more than all the elephants that have ever lived on the planet.

    What do you think of your Chinese? If you think your Chinese is good enough, you can take part in the competition named Chinese Characters Dictation Competition(中国汉字听写大会).

    Today teenagers are using more and more smart phones. They spend too much time in shopping, chatting, playing games and so on. Many of them cannot using smart phones to help with their study. Overuse of smart phones will make students too lazy to think and write. Some of them even forget how to write Chinese characters by hand. Teachers and parents are very worried about it.

    In order to draw people's attention to the problems above, in 2013 CCTV held the first Chinese Characters Dictation Competition. About 200 students from 32 teams took part in it. They stood on the stage to write down Chinese characters by dictation. Lu Jialei, a 14-year-old girl from Zhejiang, got first place.

    Since then, the competition has been popular among teenagers. Many people are interested in this kind of competition, too. They like to write down the characters while the competitors(参赛者)are writing them.

    Can you be the next winner?

    The British Museum is a museum dedicated to human history, art and culture, located in the Bloomsbury area of London. Its permanent collection, numbering some 8 million works, is among the largest and most comprehensive in existence and originates from all continents, illustrating and documenting the story of human culture from its beginnings to the present.

    The British Museum was established in 1753, largely based on the collections of the physician and scientist Sir Hans Sloane. The museum first opened to the public on 15 January 1759 in Montagu House in Bloomsbury, on the site of the current museum building.

    Admission and opening times

    Free, open daily 10: 00—17: 30.

    The Museum is open every day except for 24, 25 and 26 December and 1 January.

    Museum galleries are open daily 10: 00—17: 30, and most are open until 20: 30 on Fridays.

    Closing starts from 17: 20 (20: 20 on Fridays).

    Tips for your school visit

    It's a good idea to come and see the Museum before your visit. Whatever your plans, please book in advance via the Ticket Desk to make sure you get the most out of your trip.

    Booking your visit

    Contact the Ticket Desk at ＋44(0)20 7323 8181 or tickets @ britishmuseum.org

    Cancellation

    If you are not able to attend a session you must inform the Ticket Desk at least three weeks before the session date. Failure to do so may incur a charge.

    Gallery availability

    Please book at least one term in advance and wait for confirmation before making travel plans. Greek and Egyptian galleries book up quickly. Opening times of some galleries may be limited at short notice—you will be contacted if necessary.

    Access and special educational needs

    The majority of galleries and all special exhibitions are fully accessible. There is a range of facilities for visual, hearing and mobility impaired students.

    Parking

    There is little on-street parking available. The nearest car park to the Museum is located at Bloomsbury Square, WC1A 2RJ. There is limited parking in the Museum's forecourt for disabled visitors only. To make arrangements please telephone＋44 (0)20 7323 8299 at least 24 hours in advance. You will be asked to provide the registration number, make and model of your vehicle and the date of your visit.

    Support us

    Your support is vital in enabling the Museum to fulfill its mission to share its collection with the world. The British Museum relies on funding from a wide range of sources and there are many ways that you can donate to help ensure the display, care and preservation of the collection for future generations.

    Please consider supporting the British Museum today.

    A photography exhibition by French artist San Bartolome entitled Moon Door Dreamers opened in the 798 Art Zone in Beijing on December 10, 2011, presenting a cross-cultural perspective (视角) on ordinary life in the capital city.

    Bartolome took these photos in August 2008, and produced a video named Two Worlds, One Dream. These works were displayed in Pingyao, an ancient city in Shanxi Province, under the title Beijing Midsummer Night Dream in September 2010.

    The moon doors serve as a keyhole through which one can catch a glimpse of a slice of Beijing life. He got his inspiration from one cycling trip to the southeastern suburb of Beijing, where he discovered a peculiar street along which a gray brick wall was built to cover the shabby bungalows. These cabins were mostly rented by migrant workers- peddlers, craftsmen, grocers and innkeepers.

    Born in 1950, Bartolome has worked as a photographer, stage director. Artistic manager, writer and diplomat. A noted Sinophile, Bartolome frequently visits China for photographic subjects. In the fall of 2003, he joined the French Embassy in Beijing as a cultural attache. His work experience in China from 2003 to 2015 further enhanced his awareness of and love for China.

    Bartolome not only loves Chinese culture but also the Chinese people. He thinks that Chinese people are kind, welcoming and diverse.

    Back from his bike ride to southeastern Beijing, he decided to shoot pictures about ordinary urban lifestyles. He observed dwellers carefully and made friends with them.

    After about 30 days and nights that he spent with these common migrants, he created a number of portraits. Meanwhile, he learned more about those rural migrants who earn their living in a city with which they are unfamiliar.

    He adopted an optimistic perspective to shoot the sights, and he borrowed the title of one of William Shakespeare s comedy works: A Midsummer Night's Dream.

Four Top Family Camping Trips

Camp Clearwater: White Lake, North Carolina

Camp Clearwater in White Lake, North Carolina, features its own 1, 100-acre lake complete with 1, 300 feet of shorefront. On-site facilities here include a mini-golf area, sports fields and a park that allows pets. Further, the family campground hosts various activities, including games, cornhole tournaments and golf cart parades. Overnight campsites run from $40 to $60 per night. 

A Tiny House Resort: Cairo, New York

Those cager to try tiny living in a natural setting should check out this tiny location in the heart of the Catskills Mountains region. There are on-site facilities including a pool, a dog park, kayaks, massage services and even goat yoga. You can spend your time walking on the waterfront trails or relaxing on a boat. Rates start at $295 per night for tiny homes that sleep two, but some tiny homes with more space for additional guests or amenities（便利设施） cost more. 

Meeman-Shelby Forest: Memphis, Tennessee

The Meeman-Shelby Forest State Park features 12, 539 acres of outdoor space along the Mississippi River. This area is known for its magnificent trees as well as the many endangered and protected plants that call it home. You can camp here in a two-bedroom cabin（小木屋） or on one of the 49 campsites. Cabin rentals start around $110 per night, and you can rent a camping spot for as little as $25 per night. 

Flamingo Adventures at the Everglades: Florida Keys

Families within close driving distance to the Florida Everglades have plenty of outdoor options to consider, including houseboat and eco-tent rentals through Flamingo Adventures. Houseboat rentals sleep four adults and two kids maximum and prices start at $350 per night. Eco-tents, which sit on platforms and feature bed linens, electricity, sitting areas and plenty of storage, start at $50 per night.