A roller coaster, sometimes known as a roller coaster, is an amusement attraction that features tight bends, steep slopes, and sometimes inversions on an elevated train track. Open vehicles are used to travel along the track, and the rides may be found in amusement parks and theme parks all over the world.

Paper is a thin sheet material made by physically or chemically processing cellulose fibres from wood, rags, grasses, or other vegetable sources in water, then draining the water through fine mesh to leave the fibre equally spread on the surface, pressing, and drying.

Dreamworld - a place make thrilling new and wonderful memories at the fantasy world kids and teenagers have always loved. Everybody dream, who can live in a illusion or fantasy and romantic dreamworld!

The use of chemistry and physics in all elements of photography is referred to as photography science. In order to shoot and develop photographs properly, this applies to the camera, its optics, physical operation of the camera, electronic camera internals, and the process of developing film.