The real reason you can't smile in passport photos is surprisingly practical
It has nothing to do with humans at all.

There's a reason you can't smile in passports and it's surprisingly practical.
Most of us have been trained since before we could talk to smile when someone is taking our picture. It's almost a Pavlovian response at this point, especially when that picture is going to be representative of you for years to come in an official capacity. Driver's license pictures usually involve people attempting to look their best, or at least as presentable as possible, complete with a smile.
Passport photos are no different, except when you get to the passport photo place with your freshly coifed hair, showing off that beautiful smile, you're told to cut it out. Well, maybe in nicer words, but the sentiment is still the same. Keep your teeth behind your lips; there's no smiling in passport photos. But why?
I've personally never understood why this was a thing for the government to be concerned about. You're likely getting your passport to go somewhere exciting or visit family in another country (which is also exciting), so why no smiles?
Technically, according to the State Department, you can smile, but only if you look like you don't want to. Kidding. In its Frequently Asked Questions, the State Department explains that smiling is allowed, "but make sure both your eyes are open and your mouth is closed in your photo." So essentially a closed-mouth smile rather than a big toothy grin. But it also can't be a smile that emits a lot of emotion since the website states also states that you must have a "neutral facial expression."
So it's not that you can't smile, it's that you can only do a very specific type of smile. In an interview with HuffPost, Karolina Turowska, a biometric photography and travel expert at Passport Photo.Online said, “The main reason for banning smiling is the introduction of facial recognition software at airports and other border control checkpoints.”
Seems the actual reason for the "ban" on smiling in passport photos doesn't have anything to do with postal service workers trying to keep you from living your best life. It's because of the robots...or at least the algorithms. Evidently, it's difficult for computer-based software programs to tell humans apart if our faces are contorted in a joyous way.
“Algorithms don’t work as we do. To compare a 3D face with a 2D passport photo, they need to pinpoint and measure the users’ facial features. It includes the distance between the pupils, ears, nose and mouth, the mouth’s and the eyes’ width, and many others. Smiling can make it harder, as it alters facial proportions,” Turowska told HuffPost.
Smiling isn't the only no-no in passport photos. According to US Passport Service Guide, you can get your passport rejected for a number of reasons and only one of them is smiling like The Joker. Wearing glasses, submitting an edited picture and using the wrong background are all reasons your passport photo can be denied.
If you're due to renew your passport or if you're going for your first one, it's best to review all the rules before submitting your photo or showing up at your nearest Walgreens. It's better to lead with caution on this one or it could delay you receiving your little book of world stamps. Happy traveling, folks.
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There's a reason why some people can perfectly copy accents, and others can't
Turns out, there's a neurodivergent link.
A woman in black long sleeve shirt stands in front of mirror.
Have you ever had that friend who goes on vacation for four days to London and comes back with a full-on Queen's English posh accent? "Oooh I left my brolly in the loo," they say, and you respond, "But you're from Colorado!" Well, there are reasons they (and many of us) do that, and usually it's on a pretty subconscious level.
It's called "accent mirroring," and it's actually quite common with people who are neurodivergent, particularly those with ADHD (Attention Deficit Hyperactivity Disorder). According Neurolaunch, the self-described "Free Mental Health Library," "Accent mirroring, also known as accent adaptation or phonetic convergence, is the tendency to unconsciously adopt the accent or speech patterns of those around us. This linguistic chameleon effect is not unique to individuals with ADHD, but it appears to be more pronounced and frequent in this population."
Essentially, when people have conversations, we're constantly "scanning" for information—not just the words we're absorbing, but the inflection and tone. "When we hear an accent, our brains automatically analyze and categorize the phonetic features, prosody, and intonation patterns," writes Neurolaunch. For most, this does result in copying the accent of the person with whom we're speaking. But those with ADHD might be more sensitive to auditory cues. This, "coupled with a reduced ability to filter out or inhibit the impulse to mimic…could potentially explain the increased tendency for accent mirroring."
While the article explains further research is needed, they distinctly state that, "Accent mirroring in individuals with ADHD often manifests as an unconscious mimicry of accents in social situations. This can range from subtle shifts in pronunciation to more noticeable changes in intonation and speech rhythm. For example, a person with ADHD might find themselves unconsciously adopting a Southern drawl when conversing with someone from Texas, even if they’ve never lived in the South themselves."
People are having their say online. On the subreddit r/ADHDWomen, a thread began: "Taking on accents is an ADHD thing?" The OP shares, "My whole life, I've picked up accents. I, myself, never noticed, but everyone around me would be like, 'Why are you talking like that??' It could be after I watched a show or movie with an accent or after I've traveled somewhere with a different accent than my 'normal.'
They continue, "Apparently, I pick it up fast, but it fades out slowly. Today... I'm scrolling Instagram, I watch a reel from a comedian couple (Darcy and Jeremy. IYKYK) about how Darcy (ADHD) picks up accents everywhere they go. It's called ADHD Mirroring??? And it's another way of masking."
(The OP is referring to Darcy Michaels and his husband Jeremy Baer, who are both touring comedians based in Canada.)
Hundreds of people on the Reddit thread alone seem to relate. One comments, "Omfg I've done this my whole life; I'll even pick up on the pauses/spaces when I'm talking to someone who is ESL—but English is my first language lol."
Sometimes, it can be a real issue for those around the chameleon. "I accidentally mimicked a waitress's weird laugh one time. As soon as she was out of earshot, my family started to reprimand me, but I was already like 'oh my god I don’t know why I did that, I feel so bad.'"
Many commenters on TikTok were shocked to find out this can be a sign of ADHD. One jokes, "Omg, yes, at a store the cashier was talking to me and she was French. She's like 'Oh are you French too? No, I'm not lol. I'm very east coast Canada."
And some people just embrace it and make it work for them. "I mirror their words or phrase! I’m 30. I realized I start calling everyone sweetie cause my manager does & I work at coffee shop."