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Albert V. Sadacca (February 6, 1901 – December 8, 1980 [1]) is credited with popularizing electric Christmas tree lights for private use. According to the legend, in 1917, at the age of 15, after a fire in New York City started by candles suspended in a tree, Sadacca adapted the novelty lighting that his parents sold for use in Christmas trees.
The following articles contain lists of problems: List of philosophical problems; List of undecidable problems; Lists of unsolved problems; List of NP-complete problems;
Janet and Allan Ahlberg, The Jolly Christmas Postman [2] Maya Angelou, Amazing Peace [2] [3] L. Frank Baum, The Life and Adventures of Santa Claus; Julia Donaldson and Axel Scheffler, Stick Man [2] Richard Paul Evans, The Christmas Box, The Light of Christmas [2] [4] Cornelia Funke, When Santa Fell to Earth; Matt Haig, A Boy Called Christmas
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A pre-lit tree is an artificial Christmas tree which is pre-wired with Christmas lights. The lights are wrapped around the tree before it is sold, reducing set up time and making storage simpler. The lights cannot usually be removed from the tree because they are normally embedded within the artificial branches.
The displays utilize Christmas lights in many ways, including decking towering Christmas trees in public squares, street trees and park trees, adorning lampposts and other such structures, decorating significant buildings such as town halls and department stores, and lighting up popular tourist attractions such as the Eiffel Tower and the ...
Many, if not most, undecidable problems in mathematics can be posed as word problems: determining when two distinct strings of symbols (encoding some mathematical concept or object) represent the same object or not. For undecidability in axiomatic mathematics, see List of statements undecidable in ZFC.
Christmas trees are also vulnerable to fungal pathogens and their resultant illnesses such as root rot, and, in the U.S. state of California, sudden oak death. Douglas-fir trees in particular are vulnerable to infections from plant pathogens such as R. pseudotsugae. Larger pests also pose a threat to Christmas tree plantations and harvests.