It is commonly believed that all over the world,boys and girls attend a mixed school,where they study together. But boys' schools are the perfect place to teach young men to express their emotions and involve them in activities such as arty,dance and music.

    Always boys at single-sex schools were said to be more likely to get involved in cultural and artistic activities that helped develop their emotional expressiveness,rather than feeling they had to correspond to（和…相符）the "boy code" of hiding their emotions to be a "real man".

    Surprisingly,the findings of the study go against received wisdom that boys do better when taught alongside girls.

    George Car,headmaster of Eton,warned that boys were being failed by the British education system because it had become too focused on girls.He criticized teachers for failing to recognize that boys are actually more emotional than girls.

    The research argued that boys often perform badly in mixed schools because they become discouraged when girls do better earlier in speaking and reading skills.

    But in single-sex schools teachers can adjust lessons to boys' learning style,letting them move around the classroom and getting them to compete in teams to prevent boredom,wrote the study's author,Abigail James,of the University of Virginia.

    Teachers could encourage boys to enjoy reading and writing with "boy-focused" approaches such as themes and characters that appeal to them.Because boys generally have more acute vision,learn best through touch,and are physically more active,they need to be given"'hands-on" lessons where they are allowed to walk around."Boys in mixed schools view classical music as feminine（女性的）and prefer the modem genre（类型）in which violence and sexism are major themes,"James wrote.

    Single-sex education also made it less likely that boys would feel that they had to be "masterful and in charge" in relationships."In mixed schools,boys feel forced to act like men before they understand themselves well enough to know what that means,"the study reported.

    Are you looking for some new and exciting places to take your kids to? Try some of these places:

    Visit art museums. They offer a variety of activities to excite your kids'interest. Many offer workshops for making hand-made pieces, traveling exhibits, book signings(签名）by children's favorite writers, and even musical performances and other arts.

    Head to a natural history museum. This is where kids can discover the past from dinosaur models to rock collections and pictures of stars in the sky. Also, ask what kind of workshops and educational programs are prepared for kids and any special events that are coming up.

    Go to a Youtheater. Look for one in your area offering plays for children and family visitors. Pre-show play shops are conducted by area artists and educators where kids can discover the secret about performing arts. PuPPet (木 偶）making and stage make-up are just a couple of the special offerings you might find.

    Try hands-on science. Visit one of the many hands-on science museums around the Country • those science play-lands are great fun for kids and grown-ups alike. They will keep your child mentally and physically active the whole day through while pushing buttons, experimenting, and building. When everyone is tired, enjoy a fun family science show, commonly found in these museums.

    A day in the life of 18-year-old David Lanster is full of teenage activities: school, baseball practice, homework. And then he starts cooking. "Some nights I'm up until 1 a.m. making pies, or even later if we're cooking beef," said the student at Ransom Everglades High School in Florida, US.

    For the past year, Lanster and Kelly Moran, his classmate, have been hosting fancy dinner parties at Lanster's parents' home. Their meals have 17 courses and are all made by them. Their guests used to give them gifts to thank them, until the pair decided to do something nice for charity. "We got some really great Miami Heat tickets, a nice watch, and many kitchen machines," Lanster said. "But we wanted to make this something positive for people rather than us."

    Lanster and Moran focused on Common Threads, a charity(慈善机构) that helps to teach kids in poor neighborhood to cook and make healthy eating choices. The young cooks ask their guests to give however much they want as payment for their meals. It all goes to Common Threads because Lanster's parents cover their food costs. After their last 12-person event, Lanster and Moran gave $1,600 to the charity. Now, they're taking their show out of the kitchen and on the road. Lanster and Moran have started to organize private dinner parties in a similar way: the host pays for the ingredients(食材), and the guests make a donation (捐赠) to a charity.

    Outside the kitchen, the two are busy preparing their college applications. Neither is sure what they will do in the future, but they've promised their parents that they'll leave cooking alone until they finish high school.

    Here are some music festivals that you might be interested in.

    Boogie

    Tallarook, VIC(26－28 March)

    Boogie is definitely kid-friendly, but with a few rules. Kids are welcome, but need to be fully supervised(监管) at all times and out of the licensed area by 10 pm. Kids under 8 years old are admitted for free. Kids between 8 and16 get in cheaper. There are some activities for kids and a great kid-friendly area.

    Splendour in the Grass

    Byron Bay, NSW(24－26 July)

    Look, Splendour can be pretty crazy, so if you and your kids are out of practice with handling festivals and the stress they can sometimes bring, maybe you should try starting smaller. But if you feel like you can do it, then your kids are welcome to hit Splendour with you. The usual rules apply — you'll need to have them with you at all times if they are under 16 and they can't go into bars. If the child is under 11, then they will get in for free.

    The Gum Ball

    Hunter Valley, NSW(22－24 April)

    We didn't originally include the Gum Ball because they took last year off and we wanted to make sure they were definitely returning. Not because we have anything against them. On the contrary, they are one event that manages to balance brilliant music and a family-friendly vibe(氛围).

    Bellingen Turtlefest

    Bellingen(30 September－2 October)

    Great music for a great cause! Bellingen Turtlefest has been set up to raise funds and awareness for the critically endangered Bellinger River Snapping Turtle, while giving families a chance to enjoy some great music at the same time. There's a kidzone, sideshows, workshops and markets, but also an education center and some guest speakers so that the kids (and you) can learn a thing or two while you're at the event.

My 13-year-old daughter sent a postcard to us while we were still away on our most recent trip to California. It 1 our house about a week later. The touching 2 nearly brought me to tears.

"Even though we 3 have two days of adventures ahead of us, I am just so 4 for everything we have experienced together on this trip," she writes.

Our youngest daughter is just about to 5 11 years old. In those years, we have never taken a true 6 as a family of four to a place we've never been. Like most 7 , I have no idea where the time has gone. But I also think these are some of the best ages to 8 with kids.

This vacation to California was our very first 9 , long-distance trip together. The kids helped 10 the trip with input on things they might like to see and do. They reached for our hands in crowds. I can't remember the last time they held our hands 11 .

One of our family bonding moments came when we took a family surfing lesson. It was the first time any of us had tried surfing, although it was something the girls had been 12 . The smiles on the girls' faces were everything. They were so 13 when they stood up on the board and rode the waves one by one.

Those are memories I'm going to 14 . And yes, I will remind them of these times the next time I reach for their 15 .

The periodic table of elements is a common sight in classrooms，campus hallways and libraries. The mode periodic table arranges the elements by their atomic numbers and periodic properties（周期性）. Several scientists worked over a century to assemble the elements into this format. 

In 1789，French chemist Antoine Lavoisiertried grouping the elements as metals and nonmetals. Forty years later，German physicist Johann Wolfgang Dobereiner observed similarities in physical and chemical properties of certain elements. He arranged them in groups of three in increasing order of atomic weight and called them triads，observing that some properties of the middle element，such as atomic weight and density，approximated the average value of these properties in the other two in each triad. 

A breakthrough came with the pu blication of a revised list of elements and their atomic masses at the first international conference of chemistry in Karlsruhe，Germany，in 1860. They concluded hydrogen would be assigned the atomic weight of 1 and that the atomic weight of other elements would be decided by comparison with hydrogen. For example，carbon，being 12 times heavier than hydrogen，would have an atomic weight of 12. 

In 1869，Russian chemist Dmitri Mendeleev created the framework that became the moder periodic table，leaving gaps for elements that were yet to be discovered. Mendeleev predicted the properties of some undiscovered elements and gave them names such as"eka-aluminum"for an element with properties similar to aluminum. Later "eka-aluminum"was discovered as gallium. 

German chemist Lothar Meyer produced a version of the periodic table similar to Mendeleev's in 1870. He left gaps for undiscovered elements but never predicted their properties. The Royal Society of London awarded the Davy Medal in 1882 to both Mendeleev and Meyer. The later discovery of elements predicted by Mendeleev verified（证实）his predictions and his periodic table won universal recognition. In 1955 the 101st element was named mendelevium in his honor. 

On UNESCO website，it wrote，"The Periodic Table of Chemical Elements is more than just a guide or catalogue of the entire known atoms in the universe；it is essentially a window on the universe，helping to expand our understanding of the world around us. "