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Solar cell - Wikipedia, the free encyclopedia

A solar cell (also called a photovoltaic cell) is an electrical device that converts the energy of light directly into electricity by the photovoltaic effect. It is a ...

Smelting - Wikipedia, the free encyclopedia

Smelting is a form of extractive metallurgy; its main use is to produce a metal from its ore. This includes production of silver, iron, copper and other base metals ...

The Energy Story - Chapter 2: What Is Electricity?

The Energy Story is a general introduction to energy. Chapters explore renewable energy, fossil fuels, electricity, circuits and many other things.

What is dementia? The signs, symptoms and …

Dementia is a term used to describe various symptoms of cognitive decline such as forgetfulness, but is not a clinical diagnosis itself until an underlying disease or ...

stem - definition of stem by The Free Dictionary

stem 1 (st m) n. 1. a. The main ascending axis of a plant; a stalk or trunk. b. A slender stalk supporting or connecting another plant part, such as a leaf or flower.

cirrhosis - definition of cirrhosis by Medical …

Cirrhosis Definition. Cirrhosis is a chronic degenerative disease in which normal liver cells are damaged and are then replaced by scar tissue. Description