Nowadays people's life develops quite rapidly. Many things have changed over the last century. Old buildings are replaced by skyscrapers. Telephone, air-conditioner, TV, digital camera, computer and the Internet have taken their place in our life. We have stepped into Information Age. We are always enjoying the newest digital products. With all these hi-tech products, people are leading a more and more colorful life. They are enjoying life more than ever in their spare time. They can wat...