Vitamins require no digestion and are absorbed directly into the blood stream. The thirteen vitamins identified are divided into two groups, fat-soluble and water-soluble.
TIFF is a computer file format for storing raster graphics images, popular among graphic artists, the publishing industry, and both amateur and professional photographers in general. The format was originally created by the company Aldus for use in desktop publishing.
Tuff: An igneous rock that contains the debris from an explosive volcanic eruption. It often contains fragments of bedrock, tephra and volcanic ash. The specimen shown here is about two inches (five centimeters) across.