Royalty-free licenses let you pay once to use copyrighted images and video clips in personal and commercial projects on an ongoing basis without requiring additional payments each time you use that ...

A description of the terminology and methodology used in this supplement, and a guide to the functionality that is available free online at natureindex.com. The Nature Index is a database of ...

Controlling nature by bulldozing dirt and pouring concrete has long been the guiding vision of the U.S. Army Corps of Engineers. For 250 years that ethos inspired both awe and disgust.