A primary tumour is the name for where a cancer starts. Cancer can sometimes spread to other parts of the body – this is called a secondary tumour or a metastasis. Cancer and its treatments can affect ...

Natural hazards are extreme natural events that can cause loss of life, extreme damage to property and disrupt human activities. Human activities can influence how often certain natural hazards ...

Browse 91,200+ 2d animation stock videos and clips available to use in your projects, or search for 2d animation character to find more stock footage and b-roll video clips. Twinkling stars animation, ...

“It can hardly be argued that either students or teachers shed their constitutional rights to freedom of speech or expression at the schoolhouse gate.” These words written by U.S. Supreme Court ...