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In botany, a leaf is an above-ground plant organ specialized for photosynthesis. For this purpose, a leaf is typically flat (laminar) and thin. There is continued debate about whether the flatness of leaves evolved to expose the chloroplasts to more light or to increase the absorption of carbon dioxide. In either case, the adaption was made at the expense of water loss...

The Lou Ruvo Center for Brain Health (LRCBH), officially the Cleveland Clinic Lou Ruvo Center for Brain Health, opened on July 13, 2009 in Las Vegas, Nevada that is operated by the Cleveland Clinic and was designed by world-renowned architect, Frank Gehry of Gehry Partners in Santa Monica, California. The ceremonial groundbreaking of the Lou Ruvo Center for Brain Health occurred on February 9, 2007...

Advertising is a form of communication intended to persuade an audience (viewers, readers or listeners) to purchase or take some action upon products, ideas, or services. It includes the name of a product or service and how that product or service could benefit the consumer, to persuade a target market to purchase or to consume that particular brand. These messages are usually paid for by sponsors and viewed via various media...

A sinkhole created by tropical storm Agatha covers a street intersection in dowtown of Guatemala City on Sunday, May 30, 2010. Torrential rains brought by the first tropical storm of the 2010 season pounded Central America and southern Mexico, triggering deadly landslides. A sinkhole, also known as a sink, shake hole, swallow hole, swallet, doline or cenote, is a natural depression or hole in the surface topography caused by karst processes - the chemical dissolution of carbonate rocks...