This collection provides high quality streaming videos on business & economics, health & medicine, humanities & social sciences, and science & mathematics, as well as travel and fitness programming, home and how-to videos, indie films, and popular music performances. Linking/Embedding Issues with MS PPT
Look at the web address for clues about the quality of the information. The last part of a website address is the domain suffix and can give you an idea about the quality of the site. Some common examples are .com, .org, .edu, and .gov.
Restricted top level domains (only qualified entities can use these domains):
Unrestricted top level domains (anyone, good or bad, can use these domains):