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Section of epididymis. Connective tissue (blue) is seen supporting the epithelium (purple)

Connective tissue is one of the four types of tissue in traditional classifications (the others being epithelial, muscle, and nervous tissue.) It is characterized by abundant extracellular matter (intercellular substances and fibers) encasing relatively few cells. The various combinations of the elements in this intercellular matrix give the tissue its character, resulting in different kinds of connective tissue.

Popular Article: Geologic time scale

Clock representation shows some of the major units of geological time and definitive events of Earth's history

The geologic time scale is used by geologists and other scientists to map the timing and relationships between events that have occurred during the history of the Earth. Different spans of time on the time scale are usually delimited by major geologic or paleontologic events, such as mass extinctions. For example, the boundary between the Cretaceous period and the Palaeogene period is defined by the extinction event that marked the demise of the dinosaurs and of many marine species.

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The phenomenon of magnetism was known in ancient times but it was not until the nineteenth century that the connection was made between magnetism and electricity (source: Magnetism)

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