railroad signal

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semaphore railroad signals

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Colorful winter sunset

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Saint Lucia Day. Young girl wears Lucia crown (tinsel halo) with candles. Holds Saint Lucia Day currant laced saffron buns (lussekatter or Lucia's cats). Observed December 13 honor virgin martyr Santa Lucia (St. Lucy). Luciadagen, Christmas, Sweden

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Srinivasa Ramanujan, Indian mathematician and autodidact.

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Town of Sisimiut located on the coast of the Davis Strait on Kangerluarsunnguaq Bay, Greenland

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railroad signal: References & Edit History

Article Contributors

Primary Contributors

The Editors of Encyclopaedia Britannica

Other Encyclopedia Britannica Contributors

Article History

Type	Description	Contributor	Date
	Add new Web site: Fact Monster - Science - Signaling.	Darshana Das	Jul 01, 2011
	Media added.	Amy Tikkanen	Jul 16, 2010
	New article added.	Robert Curley	Feb 12, 2009