Medical research

Skin aging: A synergy between cigarette smoke and sunlight

Combined exposure of the skin to cigarette smoke and UV rays could lead to faster premature aging, according to a study by Université Laval and the Centre de recherche du CHU de Québec-Université Laval.

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Forest

A forest is an area with a high density of trees. There are many definitions of a forest, based on the various criteria. These plant communities presently cover approximately 9.4% of the Earth's surface (or 30% of total land area) in many different regions and function as habitats for organisms, hydrologic flow modulators, and soil conservers, constituting one of the most important aspects of the Earth's biosphere. Although a forest is classified primarily by trees a forest ecosystem is defined intrinsically with additional species such as fungi. A woodland, with more open space between trees, is ecologically distinct from a forest.

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