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The tomb of Saint Nicholas in the crypt of the Basilica di San Nicola, Bari, Apulia, Italy

Do the Relics of Saint Nicholas Really Emit a Holy Substance?

Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)

7 of the World’s Deadliest Shipwrecks

Thanksgiving Turkey with all the sides

Why Do We Eat Turkey on Thanksgiving?

Title: Senate Square, St. Petersburg, December 14, 1825: repression of the troop mutiny - watercolor by Carl Ivanovitch Kollman, 1825 depicts Decembrist uprising clashing with cavalry, with spectators watching. (new style December 26, 1825) Europe. Saint

8 of the Largest Empires in History

Image of Antenna galaxy

The Fermi Paradox: Where Are All the Aliens?

Chinese dragon sculpture or statue.

10 Legendary Creatures from Around the World

Cheetah (Acinonyx jubatus) standing on rock, side view, Masai Mara National Reserve, Kenya

The Fastest Animals on Earth

neutral filter

optics

Learn about this topic in these articles:

manufacture and optical properties

In optics: Filters and thin films
A neutral filter absorbs all wavelengths equally and merely serves to reduce the intensity of a beam of light without changing its colour.
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