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Why Do People Say the Moon is Made of Cheese?

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Everybody knows that Earth’s only satellite does not, in fact, consist of fatty dairy products. So where did the myth that the moon is made of cheese come from in the first place?

Though the idea that the moon is made of cheese has been around for millennia, it’s doubtful that anyone ever actually believed it, at least not academically. The earliest record of this bizarre notion comes from a medieval Servian yarn in which a ravenous wolf chases a seemingly-hapless fox, hoping to score an easy meal. Thinking fast, the fox convinces his pursuer that the moon’s reflection on a nearby pond is actually a block of cheese floating on its surface and that the wolf must drink all of its water to acquire the tasty treat. Guzzling and guzzling his way to the prize, the wolf eventually drinks too much and bursts, leaving the fox alive and victorious.

But the best-known early citation dates to 1546, and can be found in The Proverbs of John Heywood (which can be read in its entirety here). The document is a compendium of some of the titular author’s most famous sayings, such as “the more, the merrier,” “a penny for your thoughts,” and “Rome was not built in a day.” At one point, he jokingly states “the moon is made of greene cheese” (in this context, “greene” refers to the food’s age rather than its color).

Over the following century, the phrase came into common use. Speaking of human gullibility in 1638, the English natural philosopher John Wilkins wrote “You may… soon persuade some country peasants that the moon is made of greene cheese, (as we say).”

Despite the fact that the scientific community has never seriously supported the claim, seemingly every children’s program from Tom and Jerry to Wallace and Gromit has made its fair share of moon cheese jokes.

Even NASA couldn’t resist getting in on the fun. On April Fool’s Day 2002, the administration claimed to have “proven” once and for all that the moon was made of cheese by releasing a photoshopped image with an expiration date printed on one of its craters.

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Why You Should Never Take Your Shoes Off On an Airplane
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What should be worn during takeoff?

Tony Luna:

If you are a frequent flyer, you may often notice that some passengers like to kick off their shoes the moment they've settled down into their seats.

As an ex-flight attendant, I'm here to tell you that it is a dangerous thing to do. Why?

Besides stinking up the whole cabin, footwear is essential during an airplane emergency, even though it is not part of the flight safety information.

During an emergency, all sorts of debris and unpleasant ground surfaces will block your way toward the exit, as well as outside the aircraft. If your feet aren't properly covered, you'll have a hard time making your way to safety.

Imagine destroying your bare feet as you run down the aisle covered with broken glass, fires, and metal shards. Kind of like John McClane in Die Hard, but worse. Ouch!

Bruce Willis stars in 'Die Hard' (1988)
20th Century Fox Home Entertainment

A mere couple of seconds delay during an emergency evacuation can be a matter of life and death, especially in an enclosed environment. Not to mention the entire aircraft will likely be engulfed in panic and chaos.

So, the next time you go on a plane trip, please keep your shoes on during takeoff, even if it is uncomfortable.

You can slip on a pair of bathroom slippers if you really need to let your toes breathe. They're pretty useless in a real emergency evacuation, but at least they're better than going barefoot.

This post originally appeared on Quora. Click here to view.

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Big Questions
Where Should You Place the Apostrophe in President's Day?
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Happy Presidents’ Day! Or is it President’s Day? Or Presidents Day? What you call the national holiday depends on where you are, who you’re honoring, and how you think we’re celebrating.

Saying "President’s Day" infers that the day belongs to a singular president, such as George Washington or Abraham Lincoln, whose birthdays are the basis for the holiday. On the other hand, referring to it as "Presidents’ Day" means that the day belongs to all of the presidents—that it’s their day collectively. Finally, calling the day "Presidents Day"—plural with no apostrophe—would indicate that we’re honoring all POTUSes past and present (yes, even Andrew Johnson), but that no one president actually owns the day.

You would think that in the nearly 140 years since "Washington’s Birthday" was declared a holiday in 1879, someone would have officially declared a way to spell the day. But in fact, even the White House itself hasn’t chosen a single variation for its style guide. They spelled it “President’s Day” here and “Presidents’ Day” here.


Wikimedia Commons // Public Domain

Maybe that indecision comes from the fact that Presidents Day isn’t even a federal holiday. The federal holiday is technically still called “Washington’s Birthday,” and states can choose to call it whatever they want. Some states, like Iowa, don’t officially acknowledge the day at all. And the location of the punctuation mark is a moot point when individual states choose to call it something else entirely, like “George Washington’s Birthday and Daisy Gatson Bates Day” in Arkansas, or “Birthdays of George Washington/Thomas Jefferson” in Alabama. (Alabama loves to split birthday celebrations, by the way; the third Monday in January celebrates both Martin Luther King, Jr., and Robert E. Lee.)

You can look to official grammar sources to declare the right way, but even they don’t agree. The AP Stylebook prefers “Presidents Day,” while Chicago Style uses “Presidents’ Day.”

The bottom line: There’s no rhyme or reason to any of it. Go with what feels right. And even then, if you’re in one of those states that has chosen to spell it “President’s Day”—Washington, for example—and you use one of the grammar book stylings instead, you’re still technically wrong.

Have you got a Big Question you'd like us to answer? If so, let us know by emailing us at bigquestions@mentalfloss.com.

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