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Rural Irish landscape, Sligo, Ireland.

Why Is Ireland Two Countries?

Baseball laying in the grass. Homepage blog 2010, arts and entertainment, history and society, sports and games athletics

10 Greatest Baseball Players of All Time

Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

10 Famous Artworks by Leonardo da Vinci

Thanksgiving Celebration Traditional Dinner Setting Food Concept

Why Is Thanksgiving in the U.S. Celebrated on a Thursday?

Los Angeles Police Department wanted flyer on Elizabeth Short, aka the "Black Dahlia," who was brutally murdered in January 1947. The FBI supported the Los Angeles Police Department in the case, including by identifying Short through her fingerprints that

America’s 5 Most Notorious Cold Cases (Including One You May Have Thought Was Already Solved)

Santa Claus flying in his sleigh, christmas, reindeer

Was Santa Claus a Real Person?

Plato (left) and Aristotle, detail from School of Athens, fresco by Raphael, 1508-11; in the Stanza della Segnatura, the Vatican. Plato points to the heavens and the realm of Forms, Aristotle to the earth and the realm of things.

Plato and Aristotle: How Do They Differ?

payback time

solar power

Also known as: solar panel payback, solar power payback

Learn about this topic in these articles:

thin-film solar cells

In thin-film solar cell: Types of thin-film solar cells
smallest carbon footprint and quickest payback time of any thin-film solar cell technology on the market (payback time being the time it takes for the solar panel’s electricity generation to cover the cost of purchase and installation).
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