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Thinkstock/Erin McCarthy
Thinkstock/Erin McCarthy

How Many Spaces Should There Be at the End of a Sentence?

Thinkstock/Erin McCarthy
Thinkstock/Erin McCarthy

The question of whether you should put one or two spaces after the period at the end of a sentence elicits strong reactions on both sides. On the one-space side, this 2011 Slate article by Farhad Manjoo (which currently has over 800,000 Facebook likes) lays out the argument for why “typing two spaces after a period is totally, completely, utterly, and inarguably wrong.” Basically, it comes down to aesthetics, with Manjoo maintaining that “one space is simpler, cleaner, and more visually pleasing.” The two-space side, however, has its own idea of what’s visually pleasing, as forcefully argued in this comment to the Chicago Manual of Style Online:

About two spaces after a period. As a U.S. Marine, I know that what’s right is right and you are wrong. I declare it once and for all aesthetically more appealing to have two spaces after a period. If you refuse to alter your bullheadedness, I will petition the commandant to allow me to take one Marine detail to conquer your organization and impose my rule. Thou shalt place two spaces after a period. Period. Semper Fidelis.

The Chicago Manual of Style recommends, as most modern style guides do, the one-space rule.

Why is this a question?

The reason there is a conflict about this at all is because things changed. Early standards for typesetting used a larger space after sentences than between words. The space between sentences was an emspace, or the width of a capital M, and the space between words was one-third of that. You can see the difference in this excerpt from the 1910 edition of the Chicago Manual of Style (which at that time endorsed the larger space after sentences):

For a few hundred years, the whole issue of text spacing was the province of printers and typesetters, and the average writer never had to think about it. Then along came the typewriter, and suddenly everyone could produce printed texts. The emspace spacing standard was approximated on the typewriter by using one space after words and two after sentences. And everybody learned to type that way.

But in the middle of the 20th century, the standard started to change. New typesetting technology used by printing companies made it easier and more economical to print texts with uniform spacing. People got used to seeing this style of printed text, and many thought it looked cleaner and better. But not everyone thought so, and a conflict was born. Plus, typists had gotten used to a double-spacing thumb action that was hard to unlearn, and was transferred, through typing teachers, to the next few generations. So even when people didn’t care one way or the other about the spacing in the texts they read, when they themselves were doing the typing, they preferred to stick with the way they learned it.

Which is better?

Some people think the double space looks messy because it leaves holes and “rivers” in blocks of text. Some people think the double space makes it easier to process sentence breaks. Some people think it’s easier to type one space, because why do something twice when you can do it once? Some people think it’s easier to type two spaces because that’s how they learned it. It would seem, then, that the spacing question is a matter of opinion. Certainly, as the Economist’s Prospero Blog points out, it is not a matter of grammar. It doesn’t have as much to do with language as it does with typing, or graphic design.

Still, even if you don’t have any opinion on the matter, when you’re typing something up, you’ve got to choose one or the other. If you are writing for someone to whom it matters—your boss, your editor, your teacher, your grandma—then you should use the standard they prefer (or the style guide they follow).

These days, the two-space style is sometimes preferred for pre-publication manuscripts (e.g., as stipulated in the American Psychological Association publication guidelines), but most work is published with the one-space style. If you’re texting on your iPhone you can have it both ways—a quick double-space with your thumb will come out as a period with one space after it. That shortcut pairs the traditional typing action with the modern look, reconciling both factions through technology, the very thing that drove the wedge between them in the first place.

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Big Questions
What Makes a Cat's Tail Puff Up When It's Scared?
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Cats wear their emotions on their tails, not their sleeves. They tap their fluffy rear appendages during relaxing naps, thrash them while tense, and hold them stiff and aloft when they’re feeling aggressive, among other behaviors. And in some scary situations (like, say, being surprised by a cucumber), a cat’s tail will actually expand, puffing up to nearly twice its volume as its owner hisses, arches its back, and flattens its ears. What does a super-sized tail signify, and how does it occur naturally without help from hairspray?

Cats with puffed tails are “basically trying to make themselves look as big as possible, and that’s because they detect a threat in the environment," Dr. Mikel Delgado, a certified cat behavior consultant who studied animal behavior and human-pet relationships as a PhD student at the University of California, Berkeley, tells Mental Floss. The “threat” in question can be as major as an approaching dog or as minor as an unexpected noise. Even if a cat isn't technically in any real danger, it's still biologically wired to spring to the offensive at a moment’s notice, as it's "not quite at the top of the food chain,” Delgado says. And a big tail is reflexive feline body language for “I’m big and scary, and you wouldn't want to mess with me,” she adds.

A cat’s tail puffs when muscles in its skin (where the hair base is) contract in response to hormone signals from the stress/fight or flight system, or sympathetic nervous system. Occasionally, the hairs on a cat’s back will also puff up along with the tail. That said, not all cats swell up when a startling situation strikes. “I’ve seen some cats that seem unflappable, and they never get poofed up,” Delgado says. “My cats get puffed up pretty easily.”

In addition to cats, other animals also experience piloerection, as this phenomenon is technically called. For example, “some birds puff up when they're encountering an enemy or a threat,” Delgado says. “I think it is a universal response among animals to try to get themselves out of a [potentially dangerous] situation. Really, the idea is that you don't have to fight because if you fight, you might lose an ear or you might get an injury that could be fatal. For most animals, they’re trying to figure out how to scare another animal off without actually going fisticuffs.” In other words, hiss softly, but carry a big tail.

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Big Questions
What Happened to the Physical Copy of the 'I Have a Dream' Speech?
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AFP, Getty Images

On August 28, 1963, Martin Luther King Jr. stood on the steps of the Lincoln Memorial and gave a speech for the ages, delivering the oratorical masterpiece "I Have a Dream" to nearly 250,000 people.

When he was done, King stepped away from the podium, folded his speech, and found himself standing in front of George Raveling, a former Villanova basketball player who, along with his friend Warren Wilson, had been asked to provide extra security around Dr. King while he was speaking. "We were both tall, gangly guys," Raveling told TIME in 2003. "We didn't know what we were doing but we certainly made for a good appearance."

Moved by the speech, Raveling saw the folded papers in King’s hands and asked if he could have them. King gave the young volunteer the speech without hesitation, and that was that.

“At no time do I remember thinking, ‘Wow, we got this historic document,’” Raveling told Sports Illustrated in 2015. Not realizing he was holding what would become an important piece of history in his hands, Raveling went home and stuck the three sheets of paper into a Harry Truman biography for safekeeping. They sat there for nearly two decades while Raveling developed an impressive career coaching NCAA men’s basketball.

In 1984, he had recently taken over as the head coach at the University of Iowa and was chatting with Bob Denney of the Cedar Rapids Gazette when Denney brought up the March on Washington. That's when Raveling dropped the bomb: “You know, I’ve got a copy of that speech," he said, and dug it out of the Truman book. After writing an article about Raveling's connection, the reporter had the speech professionally framed for the coach.

Though he displayed the framed speech in his house for a few years, Raveling began to realize the value of the piece and moved it to a bank vault in Los Angeles. Though he has received offers for King’s speech—one collector wanted to purchase the speech for $3 million in 2014—Raveling has turned them all down. He has been in talks with various museums and universities and hopes to put the speech on display in the future, but for now, he cherishes having it in his possession.

“That to me is something I’ll always be able to look back and say I was there,” Raveling said in the original Cedar Rapids Gazette article. “And not only out there in that arena of people, but to be within touching distance of him. That’s like when you’re 80 or 90 years old you can look back and say ‘I was in touching distance of Abraham Lincoln when he made the Gettysburg Address.’"

“I have no idea why I even asked him for the speech,” Raveling, now CEO of Coaching for Success, has said. “But I’m sure glad that I did.”

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