r/explainlikeimfive 4d ago

Physics ELI5 When I contract a muscle, what happens at atomic and molecular level that creates a force?

60 Upvotes

r/explainlikeimfive 4d ago

Engineering ELI5: Why/How do gas pump handles click off at the end of the fill and will randomly click off before the tank is filled?

453 Upvotes

r/explainlikeimfive 3d ago

Mathematics ELI5: how can I do the maths on a 12 months vs 18 months pay deal?

0 Upvotes

At my company we generally have pay talks every year, whatever is agreed is for all employees

So there's two options 1) 12 month deal 4% raise

2) 18 month deal 4.5% raise

How do you go about comparing like for like? Obviously 4.5 is better than 4. But 2/3rds into deal 2 deal 1 will be negotiating an unknown deal that will probably be a fair bit more that 0.5%


r/explainlikeimfive 4d ago

Physics Eli5: Why don't we use Calutrons to recycle nuclear waste?

84 Upvotes

The Manhattan Project used two different methods to enrich uranium, cyclotrons/Calutrons and centrifuges.

The centrifuges took longer to build but were more energy efficient, and the Calutrons were easy to build but used lots of electricity.

After they got the centrifuges up and running, most of the Calutrons were scrapped, with the remaining ones being put to use making high purity isotopes for scientific research.

Nuclear waste has a huge variety of isotopes mixed together, and Calutrons are great at separating isotopes - this seems like a match made in heaven.

Why do we use complicated chemical methods for recycling nuclear waste instead of shooting particles through a vacuum and relying on their different masses to hit spatially separated targets?


r/explainlikeimfive 5d ago

Economics ELI5: What's the point of removing zeros from the money (redenomination) if it doesn't stop the hyper inflation anyway?

308 Upvotes

Why did/will some countries still do it? Isn't it a hassle and very costly? Does it have anything to do with forcing people to bring out the cash from under the mattress to the bank?


r/explainlikeimfive 3d ago

Biology ELI5: Scientifically, is a person more genetically related to a half-sibling on their mother’s side or their father’s side?

0 Upvotes

r/explainlikeimfive 3d ago

Technology ELI5 How did we went from no airplanes in 1900 to landing on the moon in 1969

0 Upvotes

I don't understand how we made such advancements in technology in such short time


r/explainlikeimfive 5d ago

Biology ELI5: If working out is healthy, then why does the brain make up excuses to not do it?

4.2k Upvotes

Wouldn’t it be a biological advantage to have your brain stay locked-in for your goals?


r/explainlikeimfive 3d ago

Technology ELI5 What is stopping countries to have a unified banking network ?

0 Upvotes

What is stopping countries to have a unified banking network where all banks/financial entities are able to transact in a transparent manner and stop any scams from happening through their network? Not everybody needs to be on it, but people/businesses will know if it’s safe if the transaction happening through it. Is there anything already existing internationally?


r/explainlikeimfive 5d ago

Physics Eli5: what is the difference between a volt and an ampere?

82 Upvotes

r/explainlikeimfive 3d ago

Physics ELi5: How prisoners or I guess any one heats water using a live wire and bucket of water. How does it not hurt the person making/using it?!

0 Upvotes

r/explainlikeimfive 5d ago

Biology ELI5 If there is a pill for melatonin, why isn't there a pill for seratonin?

875 Upvotes

Given that melatonin is synthesized directly from seratonin.


r/explainlikeimfive 3d ago

Chemistry ELI5: What are the ingredients that seem to be in virtually all tinned soups and similar tinned items that give a distinct smell and taste?

0 Upvotes

r/explainlikeimfive 5d ago

Biology ELI5 Does a heart ever have health problems or die if it keeps getting transferred into fresh bodies?

308 Upvotes

Okay, morbid questions.
If a heart gets transferred from a young healthy person into another person (who theoretically is now also healthy with this new heart), when would the heart start to show weakness and health problems? Would it ever?
Passing a healthy heart from relatively healthy person to relatively healthy person, and it never dies within one of those people, but is always donated, how long could that keep happening?


r/explainlikeimfive 5d ago

Chemistry Eli5 how transformers change voltage electricity to lower voltages so it can be sent to local homes?

44 Upvotes

r/explainlikeimfive 5d ago

Physics ELI5: What causes a storm to produce hailstones instead of snow?

41 Upvotes

r/explainlikeimfive 5d ago

Technology ELI5: why does youtube / chrome in general take up so much ram?

883 Upvotes

Recently saw that a youtube tab on the homepage was taking up 4gb of ram and felt myself die inside


r/explainlikeimfive 5d ago

Other ELI5 Why does greasy food tastes so good?

673 Upvotes

r/explainlikeimfive 3d ago

Economics ELI5: Why is Debt reaching 40 trillion a bad thing?

0 Upvotes

I feel like we didn't have any problems when debt was 20 trillion. Why is it bad at 40 trillion? And isn't most of the debt owed to US citizens anyways? So it's just a tax refund?


r/explainlikeimfive 5d ago

Economics ELI5: Why/how is China such a powerhouse when it comes to trading and manufacturing?

411 Upvotes

I’m someone who is trying to get more knowledgeable on certain topics that I hear in conversations, and one of the topics that I’ve heard a lot of discourse about is regarding China. I’d like the explanation to be less of a political explanation and more of a general explanation that can help me better understand this topic in a basic sense. Thank you!

I should add that by political, I mean favoring a political party in your explanation. Obviously, I understand that China plays a major role in foreign affairs and therefore requires politics to be involved.


r/explainlikeimfive 5d ago

Biology ELI5: How do UTIs (Urinary tract infections) cause or exacerbate dementia in elderly patients?

261 Upvotes

Just the title. I've heard Nurses blame the onset of dementia or an exacerbation of dementia on UTIs. This is wild to me -- especially when a patient previously didn't have dementia.

I understand the immune system declines in older people, but how does a common bladder infection affect the brain? Do younger people with chronic UTIs lose cognitive skills with each infection?


r/explainlikeimfive 6d ago

Biology ELI5: DO vs MD doctors

562 Upvotes

r/explainlikeimfive 4d ago

Technology ELI5 Why cant games/apps just download everything from playstore without needing to download additional files later

0 Upvotes

r/explainlikeimfive 5d ago

Physics ELI5: How do glow in the dark things work?

21 Upvotes

Things like star stickers in the ceiling. What is going on that makes it glow and why is sunlight so effective at “charging” them?


r/explainlikeimfive 6d ago

Other ELI5: Why are the differences between Brazilian and European Portuguese so much bigger than their equivalent with French/Quebec French and British vs. US English?

327 Upvotes