Toy designed for older audiences, such as teenagers or adults, demonstrate advanced concepts. Newton's cradle, a desk toy designed by Simon Prebble, demonstrates the conservation of momentum and energy. Not all toys are appropriate for all ages of children. Even some toys which are marketed for a specific age range can even harm the development of children in that range. "Age compression" is a toy industry term that describes the modern trend of children moving through play stages faster than they did in the past. Children have a desire to progress to more complex toys at a faster pace, girls in
China Energy Conservation and Environmental Protection Group of new building materials, and mining and dressing of scarce and rare-earth metal ores; and manufacture of communication equipment, electronic devices, information chemical products, and equipment for public society security. The company also provides services, such as computer software services, as well as assets management, technology venture investment, and financial and industrial services. China Energy Conservation and Environmental Protection Group China Energy Conservation and Environmental Protection Group Corporation formerly known as China Energy Conservation Investment Corporation (CECIC) is a Beijing-based state-owned enterprise established in 1988 by the State Council of the People's Republic of China. Its investment portfolio is committed