When Justin Tong was a child, other kids felt sorry for him. His parents always had him doing lots of housework such as carrying out the rubbish and sending newspapers. But when he grew up, he was better off than his childhood friends and lived a happier and healthier life.

This is the finding of a 40-year study that followed the lives of 456 children in London. It showed that the children who had worked hard in childhood had a richer and a happier future. "Children who worked in the home or community gained competence(能力) and came to feel they were worthwhile members of society," said Daniel Brown, the psychologist(心理学家) who made the discovery. "And because they felt good about themselves, others felt good about them."

Brown's study followed these children in great detail. Interviews were repeated at ages 25, 31 and 47. Under Brown, the researchers compared the children's mental-health scores with their childhood-activity scores. Points were awarded for part-time jobs, housework, effort in school, and ability to deal with problems.

    Working at any age is important. Childhood activities help a child develop responsibility, independence, confidence and competence — the underpinnings (基础) of emotional health. They also help him understand that people must cooperate and work toward common goals. The most competent adults are those who know how to do this.

    Yet work isn't everything. As Tolstoy once said, "One can live magnificently in this world if one knows how to work and how to love, to work for the person one loves and to love one's work."

A European Union program is letting blind people experience famous paintings for the first time. It uses three dimensional（3-D） printing to recreate famous paintings so they can be touched. 

One painting printed with the new technology is Gustav Klimt's "The Kiss". It is a popular attraction at the Belvedere Museum in Vienna, Austria. The painting shows a man and a woman standing in a field filled with flowers. They are wearing gold robes（长袍） and have their arms around each other. The man leans down to kiss the woman. 

Klimt finished the painting in 

1908. Until now, people who had trouble seeing could not appreciate the artwork. But thanks to the reproduction（复制品）, they can touch the piece and feel the ridges（隆起） and depressions. Andreas Reichinger said this reproduction was his most difficult project because the couple's robes are so detailed. 

Dominika Raditsch is a blind museum visitor. She touched the reproduction. As she moved her hands around it she said, "Exactly, can you see these? There are so many details. " Raditsch said she could imagine what the original painting looked like when she touched the reproduction. "It's somehow round. You can feel it. It comes with it. And in many places it's so smooth. And then I think to myself — it probably shines, too!" Raditsch said. 

The Belvedere is not the only museum to have 3-D versions of its artwork. Some of the pieces at the Prado, in Madrid, Spain, have reproductions that can be touched. But the piece in Vienna has one special part: it is made with widely available 3-D printing technology. That means one day, blind art fans anywhere in the world could download the source files and print the reproductions themselves.