The reason why humans started kissing each other is kinda gross but really interesting
Let's just say love has evolved.
A couple ready to smack lips.
There are few more beautiful moments in life than a romantic kiss. But there are a lot of other reasons why humans kiss, too. There’s the kiss that a parent gives a child to show them love. There’s the kiss that friends give each other on the cheek and the kiss of death from a mob boss, signaling that a member of the family is going to die.
Kisses play an essential role in the social lives of humans, but where did this behavior come from? Previous theories suggest it’s a holdover from the instinctual sucking that humans do as babies to get milk. Some researchers believe it’s behavior that evolved from when mothers would chew their baby's food before feeding it to them mouth-to-mouth.
Others have suggested that it’s a way for humans to sniff one another for “social” inspection. It’s a way of finding out where that person has been, who they've been with and what they've been eating.
Why do humans kiss?
A new research paper by Dr. Adriano R. Lameira, an Associate Professor and UK Research & Innovation Future Leaders Fellow at the Department of Psychology, University of Warwick, UK, argues that it comes from primate grooming rituals. “The most likely and straightforward evolutionary explanation is that mouth-to-mouth kissing evolved from an earlier form of kissing involving the mouth and other body parts,” he writes.
The disturbing part is that, according to Lameria, when we pucker up our lips and suck on someone else, it mimics a behavior we used to remove parasites from one another’s fur when we were apes.
Why do primates groom each other?
Grooming is a vital ritual in the world of primates. It consists of one ape picking through the fur of another and removing parasites, dead skin and debris. “Grooming helps to establish and maintain alliances, hierarchies, and group cohesion through social touch, with the consequent release of endorphins, which reduces stress and promotes feelings of well-being between groomer and groomed, further cementing social ties,” Lameria writes.
Whenever an ape finds something to remove from another’s skin, they usually eradicate it by sucking it off their body, in a behavior that works precisely like a kiss. The kiss-like motion is the last final stage of removing each piece of debris so that every grooming session ends with a final kiss. As apes evolved into humans, we lost most of our hair, so grooming sessions became shorter and shorter. “Presumably, up until the ultimate point when two individuals simply performed the last step of grooming, latching on their lips to the other's skin but having discarded the hygienic (and by now obsolete) function of grooming,” Lameira writes.
So, when we kiss each other, we're building and strengthening bonds with someone else, much like we once did through grooming rituals—only now, it's a quicker, more straightforward gesture.
As Sam, the piano player, sang in “Casablanca,” “You must remember this: a kiss is just a kiss,” but Lameira's paper shows that a kiss is much more than we could ever know. A kiss is a behavior that goes back millions of years, an example of the importance that social bonding plays among humans and other primates.
It’s interesting to learn where this behavior comes from. But, after reading this, it’s probably going to make kissing feel a bit more awkward when you consider that you are mimicking a behavior that was once used to remove bugs from your lover’s skin.
Beaver in water. Photo by 
An actual beaver dam on the now-thriving Price River
Not just coworkers—family, friends, strangers, kids…
Imagine having to go so badly but being out of euros. 
Anything hobbit-esque can't be wrong. 
But what if you need pain meds AND mascara?!
Imagine how this would affect childcare.
Honestly…where's the lie?
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Urgent dash to the bathroom! 🚪🏃♂️
Ladybug unexpectedly found during colonoscopyPhoto credit: 
Close-up of bottom of ladybug found in colonPhoto credit: 
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."