Natural (and semi-natural) vegetation is defined as “vegetation where ecological processes primarily determine species and site characteristics”. Human activities may influence vegetation interaction, ...

Log-in to bookmark & organize content - it's free! Columbia University history professor Matthew Connelly, author of "The Declassification Engine," talked about the levels of document classification ...

One of the challenges the U.S. military and intelligence communities have faced for years is quickly moving information between different networks and classification levels to reach users in a timely ...