Fact and a Photo

Prairie dogs sometimes "kiss," as seen above. They only do so within their own families, though.

Sea otters hold hands while sleeping in order to keep from drifting apart.

Duff Beer is from the Simpsons. It's fake. But someone makes Duff Energy Drink. For real. 

Fort Jefferson, Florida, is an unfinished fortress in the Florida Keys. It contains 16 million bricks, making it the largest masonry structure in the Western Hemisphere.  And, it's a ghost town -- it's been unused since the late 1800s.

In 1955, the U.S. government tested the effects of a nuclear weapon by dropping a bomb on a town in Nevada. The carnage was dramatic, as seen above. It would have been tragic, too, had the town been real, but it wasn't. All the "people" in the fake town, including the one above, were mannequins.

There are exactly 11 characters which are common to the Russian, Latin, and Greek alphabets.

In 1912 and again in 1914-15, items were excavated from Machu Picchu, above, and taken to Yale University to study. The items were supposed to be returned 18 months  later but Yale, citing a perceived inability of Peru to keep the items in good condition, retained the artifacts. In November 2010, Yale agreed in principle to return the artifacts to Peru.

The sign above is in English and Welsh. But the Welsh words do not, when translated, match the English. Rather, as explained by this BBC article, it means "I am not in the office at the moment. Send any work to be translated."

Take a look at a strong light source, like a street lamp -- and you may notice a rainbow-ish halo glowing around it. The Sun also has those, and, at times, clouds will pass over the halo to create a "fire rainbow" like that one pictured above.

The U.S. Library of Congress is the largest library in the world by shelf space and number of books.

Amsterdam's canals are man-made -- the result of a large-scale public works project.