Is your ass one muscle or two? A female coworker of mine recently signed up for a course in bellydancing. Here’s the conversation we had after her first class:
Me: Is it fun?
Her: No, I hate it. It’s way too hard. You have to, like, move the left side off your butt up and the right side down at the same time. I don’t even think that’s possible, since your butt is just one muscle.
M: Is it? I always kind of though it was two.
H: It’s called the “gluteus maximus,” so I think it’s just one.
M: Well, even so, it can’t be impossible to do that. I mean, your tongue is a single muscle, and you can move different parts of it in different direction.
H: No you can’t.
M: Sure you can. If you stick out your tongue you can move the tip of it up and down without moving the back of it.
H: Oh, I see what you’re saying. Like, the front of your tongue is the right side of my butt and the back part of your tongue is the left side of my butt?
M: I’m sorry, but as a married man I can no longer participate in this conversation.
I spent a ridiculous amount of time searching the Internet for an answer to this question. My operating assumption was that the human body only contains one gluteus maximus muscle, but I kept coming across illustrations such as the one found here which make it look like there is one gluteus maximus per leg.
Finally I dusted off my old MeFi account and Asked Metafilter. A few minutes after I posted ther query, ikkyu2 weighed in with this: “Two. Definitely, incontrovertibly two, innervated each by the inferior gluteal nerve (right and left)” and cited this page as evidence. Based on the fact that his Mefi profile page lists his occupation as “neurologist,” and that he knows how to use words like “innervated,” I’m going to believe him.
Update: Although I didn’t mention bellydancing in my Ask Metafilter post, that must be the vocation where butt muscle inventory most frequently occurs because equipoise chimed in with this: “I’m guessing [that a previous responder who said that you can't move each side of your butt independently] is not a bellydancer. In Middle Eastern dance,, you can shake your hips by squeezing the right glute, then the left, then the right, etc. … From experience, you definitely have a separate muscle in each buttock.”
What’s the origin of the phrase “tractor beam”? “We’re caught in a tractor beam! It’s pulling us in!” So says Han Solo in Star Wars: A New Hope. This may not be the first time I heard the phrase “tractor beam,” but it’s certainly the first I remember. But how one earth did a piece of farm equipment come to be associated with staple of science-fiction?
Surprisingly, there’s a website devoted to questions just like this one. Science Fiction Citations describes its mission as “hunting for the earliest citations of sf words,” and “tractor beam” is one of its many entries. It traces the phrase back to the 1931 story by E. E. Smith entitled “Spacehounds of IPC,” which includes the line “Brandon swung mighty tractor beams upon the severed halves of the Jovian vessel, then extended a couple of smaller rays to meet the two little figures …”
I found a few other pages that corroborated this, but all just attributed it the phrase to Smith without speculating as to why he chose the word “tractor.” But in this discussion thread (Google cache), someone posits a fairly plausible hypothesis: that “tractor” is just short for “attractor.” And someone else points out that there is no need to look beyond the dictionary for an explanation: the word “tractor” has, as one of its definitions, “something that pulls or draws.”
Bonus fact: accorording to this essay, E. E. Smith also gave us the words “forcefield,” “mothership,” and “hyperspace.”
Why, in legal contracts, are some line written in all capitals? I recently had to sign a lengthy indemnity waiver for an event I will soon be participating in, and while most of it was written using the standard rules of capitalization, there were many passages which were written in all-caps. That got me to wondering if the passages in all capitals shared some property, and were capitalized out of legal necessity or tradition.
I asked local blogger and legal mind Snarky, and here’s what he wrote:
Items in contracts that are in BOLD AND ALL CAPITALS are usually those areas in which (1) they are asking for an explicit waiver of an important right (and thus can claim that a reasonable person would not have overlooked the item); (2) are contractual terms that vary greatly from what a common law presumption of the terms would be, were that item not present; or (3) for mere decoration (such as “BUYER” and “SELLER” in a buy/sell contract).
Doing a little legwork on my own, I found what probably explains the presence of all-cap statements in contracts. The General Definitions section, and one thing you can do to automatically render a portion of text “conspicuous” is to put it “in capitals equal to or greater in size than the surrounding text.”