r/YouShouldKnow • • 1d ago

Animal & Pets YSK: Sharks are older than trees.

0 Upvotes

It sounds impossible, but sharks have been around for approximately 400 million years, while the earliest true trees appeared around 385 million years ago.

That means sharks were already swimming in Earth's oceans before forests even existed!

Why YSK?

Because it completely changes your perspective on how ancient these creatures are. Sharks survived multiple mass extinction events, including the one that wiped out the dinosaurs 66 million years ago.

They've outlasted countless species and entire ecosystems that once dominated the planet.

So, the next time you see a shark, remember: you're looking at an animal lineage that predates trees, dinosaurs, and even the first land vertebrates.

Nature's ultimate survivors!


r/YouShouldKnow • • 1d ago

Health & Sciences YSK what a BRUE is if you are a parent or plan to become one

2.9k Upvotes

Source: https://www.ncbi.nlm.nih.gov/books/NBK441897/

Why YSK: BRUE stands for Brief resolved unexplained event. I just had a daughter (10 days old) and all anyone ever spoke about was SIDS (sudden infant death syndrome) in birthing classes etc. Obviously SIDS is terrifying itself, but no one ever brought up BRUE. In our case, our daughter stopped breathing for around 15-20 seconds and turned pale. She eventually came to and took a breath and was completely fine, but we took her to the ER anyway. After 24 hours of monitoring, every vital sign was in the green. However, it was such a scary event that I’m not sure I will ever recover from it mentally. I want any parent or future parent to know about BRUE because god forbid it happens to anyone else. It is the most scared I’ve ever been in my life.


r/YouShouldKnow • • 1d ago

Food & Drink YSK one 18 inch pizza is more food than two 12 inch pizzas, and it cost less at every shop I checked

3.3k Upvotes

Why YSK: Pizza sizes are the diameter, but what you actually get is the area, and area goes up with the square of the size. So if you're ordering for a group, two smalls usually costs you more money for less pizza.

An 18 inch pizza is about 254 square inches. Two 12s together are about 226. So the one large is about 12% more pizza than both smalls combined.

I checked the menus of 13 independent pizza shops in Pennsylvania that sell both sizes. Two 12s cost $24.00 at the median. One 18 cost $19.75. The 18 was cheaper at all 13.

This was plain cheese pies on online ordering menus, Nov 6. No chains and no coupons, so a 2 for 1 deal can flip it.

A 16 sounds barely bigger than a 14 but it's about 30% more pizza.

If you want to check any two sizes, square both numbers and divide. 18 squared is 324 and 12 squared is 144, so one 18 is 2.25 times one 12.

Two smalls only makes sense when people can't agree on toppings, and a lot of places will do half and half if you ask.


r/YouShouldKnow • • 1d ago

Technology YSK that, related to the Microsoft outages and FAA groundings, this week is a time of year when software mistakes can be more likely.

753 Upvotes

TL;DR: Due to code freezes for the holiday season, this is often about the last week of the year for big, risky software changes. So, it’s a time when people might be pressured to release code to meet end of year goals or have their code unexpectedly broken by many simultaneous changes.

Especially while we don’t know much about the causes of these events, this info might be calming for typical people who are scared that these events might be attacks, and this info might be helpful for people in a position to try to prevent events like these.

———————

What YSK:

From my experience working in tech, now—about 2 weeks or so before Thanksgiving starts the holiday season—seems to be a common end-of-year deadline for big software changes. It’s a logical cutoff: you don’t want to make big, risky changes right before many people start going on holidays and vacation time and might not be around to fix or finish things. But, that also means that this week is when everyone is simultaneously likely to be pressured to finish and release code to meet their big end of year goals or to get last minute work in. And, when lots of people make lots of code changes in a short time, things might also break in ways they couldn’t have easily expected. Plus, people might feel more tired than usually because they’ve likely been cramming to meet that deadline, or they just feel overdue for time off that they’ve been saving.

Why YSK:

Related to the Microsoft outages and FAA groundings, many people might be nervous that these events are attacks due to their size and timing. But, especially while we don’t have much info and we’re being told these aren’t attacks, it might be reassuring or grounding to know that, based on holiday code freeze schedules, this week is a more likely time of year for software mistakes to surface.

If you happen to be someone in a position to investigate, prevent, or mitigate software events like these, this might be one small but helpful risk factor to consider. For example, maybe your team or company could consider requiring slower rollouts to extend testing periods for higher risk weeks like this.

Disclaimer:

I’m experienced but not an expert, and I don’t know the causes of these events. And I don’t say any of this to dismiss bigger causes, threats, concerns, or responsibilities. These events are scary and impactful and need to be properly investigated, and shouldn’t be dismissed by bad timing alone. Timing is just one factor of many worth considering for why these events happened and how we might prevent or mitigate future events.


r/YouShouldKnow • • 1d ago Bravo

Other ysk pimple patches work wonders on mosquito bites!

742 Upvotes

Why ysk: They’re a game changer. Literally anytime I get a mosquito bite I put a pimple patch on it and I go from itching like crazy to completely forgetting I even got bit. If you’re also someone who gets bit allll the time, try it next time!


r/YouShouldKnow • • 2d ago

Other YSK Federal Aviation Administration (FAA) issued a nationwide ground stop affecting all departing flights at all U.S. airports

528 Upvotes

I’ve got family stuck in LAX right now for an indefinite amount of time

Why YSK, the reason they’ve said is: Extraordinary circumstances

Any ideas from people on the inside?


r/YouShouldKnow • • 2d ago

Finance YSK: Scam phone callers can fake the number that appears on your caller ID.

513 Upvotes

Why YSK: If you get a call from someone claiming to be from some company, and when you look up the phone number on your caller ID it matches the number for that company, that doesn't prove anything. They have ways to fake the info that shows up on your phone. As long as they're trying to appeal to your fear or greed, and applying some sense of urgency, it's still a scam.


r/YouShouldKnow • • 3d ago

Arts & Entertainment YSK: resale prices for a lot of live events next weekend will drop in price because of the GTA VI launch.

1.2k Upvotes

Concerts, sporting events, live shows of all kinds...

This happens every few years with major worldwide releases. GTA VI is launching on November 19th.

People who have already purchased the tickets for that weekend will decide they want to play GTA all weekend instead of going out. And people who would usually buy event tickets last minute are much less likely to buy because many are planning on playing GTA.

Why YSK: if you have no plans next weekend, keep an eye on resale tickets. You may score a great deal.

Also crowds for theme parks are likely to be lower in attendance.

https://www.hollywoodreporter.com/business/digital/gta-6-hollywood-biggest-entertainment-launch-1236752195/

https://www.imdb.com/fr/news/ni66106120/?ref_=nwc_art_perm

https://www.notebookcheck.net/GTA-6-poses-a-threat-to-Hollywood-Streaming-services-and-movie-theaters-fear-losing-viewers.1448791.0.html

https://www.alwaysbewatching.com/p/where-did-all-the-men-go-watch-out

https://mashable.com/tech/gta-6-preorders-1-billion-hollywood

https://www.yardbarker.com/entertainment/articles/gta_6_is_set_to_challenge_hollywood_with_the_biggest_entertainment_launch_in_history/s1_17785_44547898

Reddit is truly getting dumber. I'm just blocking any of y'all still demanding sources. Half of y'all can't read in context or extrapolate.


r/YouShouldKnow • • 3d ago

Health & Sciences YSK That a 99% accurate medical test can only get it right 9% of the time.

0 Upvotes

Of course it depends on how many people have the disease in the first place.

Why YSK: Because people easily misunderstand statistics and what they really mean .. and don't mean.

(Disclaimer: this is a math post, not a medical post.)

The math is hard to follow while deathscrolling, so here it is laid out:

  • Say you have a population of 100,000 people.

  • 0.1% of them, or 100 people, have a disease.

  • The test is 99% accurate, which means of those 100 people, 99 will be correctly identified as having the disease, but it misses one person.

  • However, if you test the the other 99,900 people who don't have the disease, 1% of them, or 999 people, will be incorrectly identified as having the disease.

  • That makes a total of 1,098 people testing positive.

  • But there were only 100 people who actually had the disease.

  • 99 ÷ 1,098 = 0.09016, or a smidgeon over 9%.

  • So if you get tested for a disease that only 0.1% of people actually have, and you test positive on a test that is 99% accurate, your chance of having the disease is only a paltry 9%.

Veritasium: https://www.youtube.com/watch?v=2QSkkhbl3v4


r/YouShouldKnow • • 4d ago

Health & Sciences YSK: if you’re on a GLP-1 you can get a free sharps container for free from Novo Nordisk.

529 Upvotes

Why YSK: needles or syringes or “sharps” are biohazards and spread disease. A lot people use homemade sharps containers but these can be dangerous to waste disposal workers.

A sharps container is designed specially for needles and be puncture resistant.

Novo Nordisk will send you a sharps container in a box with a return label, once you fill it up you send it back and they incinerate them - for free.

Although they ask which GLP you’re on, they do not verify. So although I’m on Zepbound manufactured by Eli Lilly I was still able to secure a sharps container.

Source: As a US resident you can get a free Rx Waste Disposal shipping system by filling out the form below.


r/YouShouldKnow • • 4d ago

Technology YSK: don't wipe your parent's old iPhone until the new one is fully set up

246 Upvotes

Why YSK: if the two-factor codes still go to the old phone and someone erases it first, you can get locked out of the Apple account right when you need to sign in on the new one.

I set up my mom's new iPhone last weekend. She had erased her old phone "to be safe" before I got there, and the Apple ID password in her notebook was out of date, so the verification code went to a phone that no longer had anything on it. We got back in through account recovery, but it took most of the weekend.

What I'd do next time: check the Apple ID password works before starting, add a trusted phone number or a Recovery Contact, set up the new phone with Quick Start while the old one is next to it, and only erase the old one after everything has moved over.


r/YouShouldKnow • • 4d ago Bravo

Education YSK: A quick way to test the trustworthiness of a source is to listen what (and *how*) they speak about a subject you are well-versed in yourself

1.5k Upvotes

Why YSK: Many people are expert BS-ers, paid promoters, and other bad-faith actors. The better ones master the art of mixing truth and lies and employing a range of logical fallacies and manipulation tactics to make what they say feel believable to a non-expert.

Before trusting someone to provide a take on a subject you aren't an expert in (which is presumably why you listen to them in the first place) take a moment to learn what they have to say on a subject you do know well, and pay attention to not only what they say, but how they say it. Sometimes, generalization and "dumbing down" may be justifiable to make material more accessible to a non-expert audience, as long as it's done in good faith and doesn't twist the premises or conclusions in the process. If you're actually familiar with that subject, you will immediately notice good-faith simplification from bad-faith manipulation.

Assume that whatever they do with subjects you know well, they also do with subjects you don't, and process the information accordingly.


r/YouShouldKnow • • 6d ago Bravo

Health & Sciences YSK: most cold medicines are just a few of the same ingredients with fancy branding, one common ingredient doesn’t even work

3.7k Upvotes

Why YSK: Most things branded “cold and flu” are basically Tylenol with a couple other ingredients. Since cold season is officially here, here’s a brief guide so you can be a more informed consumer and don’t waste money on branding.

Acetaminophen: generic Tylenol. In almost every cold medicine. Be careful when taking multiple different cold meds.

Dextromethorphan: cough suppressant. Any medicine with DM has this.

Guafenesin: may thin mucous when paired with hydrating well.

Phenylephrine: very common ingredient. Does not work. Anything with this in it is a waste of money (DayQuil 👀)

Pseudoephedrine: potent decongestant. Is also a stimulant. You have to ask the pharmacist to grab this for you but you don’t need a prescription for it. Medicines with -D at the end usually have this (eg Muccinex-D).

Here’s an interactive guide if you really want to dive into it: https://eudoc.me/cold-and-flu-guide/


r/YouShouldKnow • • 6d ago Bravo

Health & Sciences YSK studies have found sleeping in a cold room is better for you as your core temperature needs to drop to signal to the brain and body that it's time to go to sleep. This lower temperature has been found to help people fall asleep faster and sleep more deeply.

3.1k Upvotes

Why YSK: people generally like an average temperature of 21+ degrees, but its been shown that 17 degrees is a more ideal temperature to trigger the body to have a deeper sleep

study cited: https://pmc.ncbi.nlm.nih.gov/articles/PMC4853167/

while the study is largely discussing wool vs cotton as an insulator, they do prove their second hypothesis that sleeping in a colder environment causes deeper and easier sleep.

"Our findings confirmed hypothesis 2 that lower temperature condition (17°C) was more conducive to sleep. Importantly, skin and core temperature variables that significantly predicted SOL, %N2, and %N3 supported these sleep findings. "


r/YouShouldKnow • • 8d ago Annoyed

Automotive YSK Progressive can and does use your driving data from their insurance device attached to your OBD-2 diagnostic port, to make a decision on whether to renew your insurance policy, alongside providing premium discounts for good driving habits.

2.0k Upvotes

Why YSK: I drive rough; I roll past stop signs in a California stop, I make sharp turns and don't time my turn signals well enough sometimes, I may brake too hard on occasion, and I'm often not gentle about my driving habits.

Therefore, I got a non-renewal notice in October 2024 from Progressive for the reason of "excess indicated debit."

I called their customer service line and also visited the local Progressive agent's office for an explanation of what that means.

They told me, in layman's terms, that the driving tracking device attached to the diagnostic port, intended to help provide discounts of our insurance premiums to good drivers, recorded that my driving habits aren't as smooth as they should be. I drove too roughly too often, so I was deemed too high of a risk to continue having a policy with them, so they gave me a non-renewal notice that mandated me to shop for a new insurance provider before the end of my coverage period on January 4th, 2025.

I'm now with State Farm, and they also have a driving tracking beacon for their Drive-Safe-&-Save program. I declined to activate the beacon because I didn't want a repeat of the non-renewal dilemma that I had already suffered with Progressive. So I'm paying $17 more per month for my auto insurance policy with State Farm in order to have the privilege of not letting my driving habits be recorded by their beacon. I'd happily pay $17 more per month than to risk getting a non-renewal notice again because old driving habits die hard. I can't suddenly improve the way I drive just because of Fall 2024's ordeal with Progressive.

So if you drive rough, don't install a driving tracking device from your insurance provider. Just absorb the extra cost of declining to participate in their safe driver discount program. Or else you run the risk of not being able to renew your policy with their company.


r/YouShouldKnow • • 9d ago

Finance YSK: Time in the market beats timing the market

1.0k Upvotes

Why YSK: With all the news of the stock market moves, it's your yearly reminder that time in the market beats timing the market.

Don't panic sell and close out your position if you don't have to.


r/YouShouldKnow • • 11d ago

Health & Sciences YSK: Condoms are made in different sizes and you need to find the right size for you.

1.9k Upvotes

Why YSK: A condom should fit snugly and securely. It should also be comfortable.

A condom that is too tight is one that causes discomfort or pain. Yes, latex stretches, but the more it stretches the more pressure it applies. Further, the more it stretches the more likely it is to break

Loose condoms can slip off or be less effective.

Use guides like this to find the best fit


r/YouShouldKnow • • 15d ago

Technology YSK: If you put -ai in front of your Google searches it won't give you that annoying summary,

1.4k Upvotes

Why YSK: Finally discovered a way to opt out, although I wish it were a setting


r/YouShouldKnow • • 15d ago

Technology YSK: You can give feedback over at Proton

0 Upvotes

Why YSK: you may be able to influence what happens next.

https://vger.to/lemmy.ml/post/54708202


r/YouShouldKnow • • 16d ago Bravo Mindblown

Technology YSK: Forms can share your info before you hit submit, so type carefully... DoorDash included

2.1k Upvotes

Why YSK: The Submit button on forms feels like the moment you agree to share your data, but on many sites that's not true. Knowing this helps you protect your privacy where it actually matters aka before you type.

I filled out DoorDash’s sign-up form with made up details and recorded my browser’s network traffic. I never clicked Sign Up. Typed in each field, confirmed my password, and did not sign up.

Within seconds:

  • One of the biggest ad platforms received hashes of my made-up email, phone number, first name and last name, sent to its main domain and to a separate gateway server on AWS.

  • A second major ad platform received hashes of the same four.

“Hashed” does not mean anonymous. Ad/marketing platforms hash their users’ emails and phone numbers the same way.

These hashes exist so they can be matched to you and your identity.

Imagine if you had a phonebook of people's names and emails, all you have to do is hash them (very simple). Once you hash everyone's names or emails, match it with the hash and voila, they know it's you! All they need is one hashed email address or one hashed phone number to know its you.

In my test, the email I typed in the DoorDash sign up form (not submitted): [email protected]

Go to any SHA256 convert tool online, and type in my email above. It will convert to this hash every time: 154495c622bf76e8771b5a14e69991100a0e13b712d4dc17acdc03444b94df27

The made up last name I used: johnsonnotreal

The SHA256 hash of johnsonnotreal:
a0e24c75886b53fa495ed7102442db2ae26f7988968b3cd5857107bf77dbd9f9

Now look at my screenshot of the transmitted data (never submitted the form): https://imgur.com/a/MNohNYI


r/YouShouldKnow • • 16d ago

Education YSK if you are interested in learning new languages and live in the states your local library most likely offers totally free access to costly language learning services.

645 Upvotes

Why YSK- Many libraries pay to subscribe to these services so that we get free access by being a member. I'm currently learning German for a future trip and I was really surprised at the services being offered completely for free.

If you are interested in learning a new language and could benefit from this absolutely check out what your local library offers. Here's a few of the common services you can get access to:

Mango

A great option for learning through everyday conversations, with easy-to-follow grammar lessons, color-coded word matching, and cultural tips to help you understand how the language is actually used.

- Normal retail cost: $13.99/month or $119.99/year.

Pronunciator

Offers courses in over 160 languages, with lessons you can customize around your interests, job, and schedule. It also includes ESL courses for speakers of over 140 native languages, American Sign Language, audio exercises, and even subtitled movies.

- Normal retail cost: $19.99/month or $199.99/year.

Rocket Languages

Focuses on helping you build confidence in speaking and listening through audio lessons that feel like real conversations, along with grammar explanations and speech-recognition exercises to practice your pronunciation.

Normal retail cost: One-time lifetime access purchase per language:

Level 1 (Beginner): Typically $149.95 (Rocket English/ASL start around $99.95).

Bundles (Levels 1–3 for advanced fluency): Up to $299.90–$449.85.

And your library could very well offer even more. Absolutly worth checking out what your library offers if you're interested in learning new languages!


r/YouShouldKnow • • 16d ago Bravo Popcorn Heartwarming

Education YSK: How to correctly use commonly confused words, contractions, and apostrophes.

1.6k Upvotes

I think I'm going to make this into a series since this was received well.

(FYI: If you’re not a native English speaker and did not take structured English classes, the comedic, yet derogatory tone of this obviously doesn’t apply to you. This is for the plebs.)

Why YSK:

As an adult, you should know how to spell commonly confused words correctly as well as use an apostrophe properly. Outside of not looking like a fool, doing so will also make you sound better in emails and be taken more seriously by people like me. It matters.

Now, let’s talk elementary-level grammar!

The following are commonly confused words and what should be used instead. A lesson on apostrophes and contractions can be found at the bottom.

1. Their, they’re, and there. The triple threat for plebs, if you will.

“Their” shows possession. Example: Their understanding of grammar is poor.

“They’re” is a contraction for “they are” - which I will further elaborate on given it seems to be one of the most difficult things for people to grasp in grammar. Anyway, here is an example: They’re reading my post to improve their grammar.

“There” refers to a place or indicates the existence of something. Example: You will likely read down there in the comments that redditors would rather attack me for correcting them than improve their grammar even though they're wrong.

2: You’re and your.

“You’re” is a contraction for “you are.” Example: You’re hopefully learning something from this.

“Your” is possessive. Example: Your feathers might be ruffled over the way I talk, but I don’t care.

3: Who’s and whose.

“Who’s” is a contraction for “who is” or “who has.” Example: Who’s still struggling with grammar?

“Whose” shows possession. Example: Whose teacher didn’t teach them properly?

4: A lot and alot.

“A lot” means a great deal of something. Example: I have a lot of disdain for people who can’t spell.

“Alot” is not a word. Your phone or computer should have autocorrected it or underlined the mistake.

5: Paid and payed.

“Paid” is the past tense of “pay.” Example: Nobody paid me for this post, but I wrote it anyway.

“Payed” is a nautical term used to describe waterproofing a ship or gradually letting a line out. Example: I have never payed anything, but I wish I was paid for this post.

6: Lose and loose.

“Lose” means you lost something, like an item, a person, or a game. Example: I often lose my mind when people use words incorrectly as if they don’t have the world’s knowledge at their fingertips.

“Loose” means something is not tight or lacks strictness. Example: Many redditors have a loose grasp on grammar.

7: Could’ve, should’ve, and would’ve. Another triple threat.

All of these words are contractions. “Could have” becomes “could’ve,” not “could of,” and so forth. Just like you should’ve known all this already.

8: Died and dyed.

“Died” is the past tense of “die,” meaning something lost its life or faded. Example: I doubt anyone has died from improper grammar, but that’s beside the point.

“Dyed” is the past tense of “dye,” meaning something has been changed with a colorful substance. Example: I have dyed my hair every color of the rainbow, but now it’s back to natural.

9: Effect and affect.

"Effect" is usually a noun, which means result or outcome. Example: I hope this post has a positive effect on your grammar.

"Affect" is usually a verb, which means to change or influence. Example: I hope this post affects your grammar.

10: Then and than.

"Then" is an adverb used to show time or sequence. Example: If you listen to me, then your grammar will improve.

"Than" is used to show difference or comparison. Example: I am clearly smarter than you plebs.

11: A part and apart.

"A part" means a piece of a larger whole. Example: Those who don't know proper grammar are a part of a bigger problem.

"Apart" means distanced from something...no longer a piece. Example: I wish I could rip some of your diplomas apart because you clearly don't deserve them.

Sidenote: when an "a" is used to prefix, it usually means the word that follows is lacking, without, or not something. Like, how some people are asexual. I, for one, am rather apathetic.

12: Chose and choose.

"Chose" is past tense and "choose" is present tense. Example: I chose to write this because a lot of you choose to be ignorant.


Now, hopefully after all these examples of contractions, you understand what they are. Unfortunately, my hopes are not very high, so I will explain as promised.

Contractions are used to shorten or combine a word or a group of words into one. This can get tricky for some people because apostrophes are used both in contractions and to indicate possession, and the rules differ.

Apostrophes are used to show possession and to form contractions. However, possessive personal pronouns and possessive determiners do not use apostrophes. For example, “its” is possessive, while “it’s” means “it is” or “it has.” Similarly, “your” and “yours” are possessive, while “you’re” means “you are.” “Your’s” is simply a misspelling of “yours.”

Generally, apostrophes aren't used to make words plural except in some cases where people use them for clarity. Apostrophes also aren't generally used to make abbreviations plural. Example: Given plebs’ opinions don’t matter, I shouldn't care about the plebs who will likely tell me to mind my p’s and q’s after reading this post. I will stop harping when they learn how to cross their t’s and dot their i’s. If you don't like the post, go read other YSKs.


r/YouShouldKnow • • 17d ago

Education YSK that many local libraries have resources such as tools and equipment that you can borrow like a book.

1.1k Upvotes

Why YSK- It will save you from buying things that you only need to use once or things that are prohibitively expensive to buy. It's called the library of things. You can also request your library to get something in stock that you can borrow. Things like telescopes and 3D printers and metal detectors etc. Super useful.


r/YouShouldKnow • • 17d ago

Education YSK roughly 2 out of 3 adults are wearing shoes that don’t fit, and it usually has nothing to do with the number on the box

0 Upvotes

a 2018 review of the research on shoe fit found that somewhere between 63% and 72% of people were wearing shoes that didn’t match either the length or the width of their feet.

part of it is that feet keep changing in adulthood. ligaments loosen and arches drop over time, which makes feet longer and wider. a University of Iowa study measured women’s feet early in pregnancy and again months after giving birth. the arches had permanently flattened and feet got 2 to 10mm longer, which is up to about a full shoe size. most of the change happened with the first pregnancy.

but the bigger thing is that heel-to-toe length is only one of three measurements, and it’s often not the one that matters most:

arch length: that metal sizing tool at shoe stores (a Brannock device) has a second slider that measures heel to the ball of your foot. if that reading says a bigger size than your heel-to-toe length, you’re supposed to go with the bigger one. people with long arches and short toes end up buying a size too small, and the ball of the foot sits in the wrong spot where the shoe bends

width: most shoes come in one default width. if your toes feel squeezed but going up a size makes your heel slip, you probably need a wide, not a bigger size

your longest toe might not be your big toe. for a lot of people the second toe sticks out further. the thumb’s width of space at the front should be measured from whichever toe is longest

also measure standing up, later in the day when feet are a little swollen, and fit the bigger foot since almost everyone has one slightly bigger than the other.

Why YSK: that same review linked poorly fitted shoes to corns, calluses, toe deformities and foot pain. most people assume that stuff is just normal and never connect it to their shoes.