Browse Reference Articles
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Urban planning
Urban, city, or town planning is the discipline of land use planning which explores several aspects of the built and social environments of municipalities and communities. In the nineteenth ... > more -
Seasonal affective disorder
Seasonal affective disorder, or SAD, also known as winter depression is an affective, or mood disorder. Most SAD sufferers experience normal mental health throughout most of the year, but experience ... > more -
Metamorphic rock
Metamorphic rock is the result of the transformation of a pre-existing rock type, the protolith, in a process called metamorphism, which means "change in form". The protolith is subjected to heat and ... > more -
Giant clam
The Giant Clam (Tridacna gigas) is the largest living bivalve mollusc. One of a number of large clam species native to the shallow coral reefs of the South Pacific and Indian oceans, they can weigh ... > more -
Heirloom plant
An heirloom plant is an open-pollinated cultivar that was commonly grown during earlier periods in human history, but which is not used in modern large-scale agriculture. Since most popular heirloom ... > more
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