r/explainlikeimfive • • 11h ago

Other ELI5: What is a freemason and how is it different from a fraternity?

261 Upvotes

Someone told me their partner is a freemason and belong to a lodge. Looking it up, it sounds very similar to a fraternity but got confused after reading about strange rituals, terminology and titles, and got an overall very secretive and elitist vibe. What is a freemason and why would someone want to be one?


r/explainlikeimfive • • 17h ago

Biology ELI5: If muscle is so essential to human health and longevity, why is it so difficult to gain and maintain?

1.7k Upvotes

r/explainlikeimfive • • 13h ago

Other ELI5: What is the difference between a Sherrif department and a Police department.

657 Upvotes

So basically the title, I live in Belgium and its a foreign concept to me, but I keep getting confronted with these terms when I consume American media. As a kid when I thought of Sherrif I thought about Cowboys. As Im older I know that not how that works.


r/explainlikeimfive • • 1h ago

Technology ELI5: How are MCP and APIs different from each other?

• Upvotes

i work in marketing and im writing landing page content for a product that has an api and mcp, so i want to understand the basics without the jargon

i searched here before posting and read a post about a similar question. i get roughly what an api is, but the explanations of mcp in the comments were too technical for me. could someone explain what mcp does and how its different from an api, in plain terms? also, where do tools like n8n and make fit in


r/explainlikeimfive • • 20h ago

Biology ELI5: How do some insects reproduce incestually for multiple generations without complete genetic degradation?

605 Upvotes

As an example, a cockroach might lay an egg somewhere that hatches hundreds of cockroaches which are all siblings, but then dozens of those siblings will mate with each other, and then their children will mate with each other, and some with their aunts/uncles potentially, and this will just go on and on with seemingly no issues. How is this possible?


r/explainlikeimfive • • 14h ago

Other ELI5 airline finances.

151 Upvotes

Why does it feel like airlines have a really difficult time being consistently profitable. With JetBlues financial issues and it feels like almost every other major airline has either filed chapter 11 or merged etc at some point. With all of the analytics, constant ticket prices changes I feel like they should be better at making a profit.


r/explainlikeimfive • • 21h ago

Technology ELI5: If a fiber optic cable or something of the sort gets damaged underground, how do people know where along the line its broken and how do they fix it?

517 Upvotes

r/explainlikeimfive • • 9h ago

Biology ELI5: phantom kicks after pregnancy

34 Upvotes

What are phantom kicks after pregnancy caused by? For me, it’s been years since I was pregnant and I still get phantom kicks. I can sometimes see them and feel them from the outside too?? It’s been happening consistently since delivery so I’m really curious.


r/explainlikeimfive • • 18h ago

Technology ELI5: Exponential Time Hypothesis (ETH)

105 Upvotes

Hopefully this is properly flaired. People have been talking about ETH and AI lately and I don't understand what ETH really is.

Bonus for ELI5: How did AI supposedly disprove ETH—But I'm mostly interested in knowing what ETH is on its own.


r/explainlikeimfive • • 15m left

Engineering ELI5: How did early civilizations create systems of measurement, and how did they develop reliable straight edges and alignment tools for building?

• Upvotes

r/explainlikeimfive • • 15h ago

Other ELI5: What does it mean to play advantage in rugby union?

31 Upvotes

I’m relatively new to playing rugby and learning a lot. One thing I have not wrapped my head around yet at all is playing advantage. Whether it’s called in one of my club matches or watching the pros play, I am not grasping the concept yet. What does it mean? When is it granted? When is it deemed over?

TIA!


r/explainlikeimfive • • 20h ago

Biology ELI5: Why do humans have birthmarks?

71 Upvotes

r/explainlikeimfive • • 1d ago

Engineering ELI5: If we can broadcast information wirelessly through an entire house, like WIFI, Bluetooth, why can't we broadcast enough energy to charge every phone in it, without cables, charging pads, or even putting the phone in a particular spot?

912 Upvotes

r/explainlikeimfive • • 18h ago

Economics ELI5: Why do stock prices sometimes drop when a company announces record profits?

21 Upvotes

r/explainlikeimfive • • 1d ago

Biology ELI5 Why do some musical chords sound sad and some sound happy? Is it learned or do our brains come this way from the factory?

1.3k Upvotes

r/explainlikeimfive • • 1d ago

Other Eli5 Why do barbers rub their razors against a leather strap. What does a leather strop do to the razor?

4.3k Upvotes

r/explainlikeimfive • • 1d ago

Technology ELI5: Why can X-rays easily pass right through our skin and muscles but get completely stopped by our bones?

151 Upvotes

r/explainlikeimfive • • 1d ago

Biology ELI5: If millions of cattle are consumed yearly why arent there more human cases of prion disease?

552 Upvotes

For example the Variant Creutzfeldt Jakob Disease


r/explainlikeimfive • • 1d ago

Engineering ELI5: aside from aerodynamics, what determines how fast a car goes? why can some cars have the similar engines in power but differ completely in their performance?

90 Upvotes

r/explainlikeimfive • • 11h ago

Planetary Science Eli5 how a celestial's body's moon can provide a measurement of both objects’ total mass?

1 Upvotes

r/explainlikeimfive • • 1d ago

Other ELI5, why did NFL footage from the 1920s and 30s look so sped up or slowed down?

228 Upvotes

r/explainlikeimfive • • 2d ago

Mathematics ELI5: If a surgery has a 1% risk of death, does that mean 1 out of every 100 people who get the surgery will die?

1.0k Upvotes

If doctors say a surgery has a 1% chance of causing death, does that literally mean that if 100 people undergo the same surgery, 1 person would be expected to die and the other 99 would survive?

Does that percentage apply to every specific person, if that's the case wouldn't that mean, theoretically, every healthy person should survive out of the 100 people since every person has a 99% chance of not dying?


r/explainlikeimfive • • 1d ago

Other ELI5: What do people mean when they refer to certain places as "liminal spaces"?

570 Upvotes

I've been seeing people talk about these things called "liminal spaces" lately mostly on posts with weird looking pictures of empty places. I don't really know much about them but I'm kinda curious. What exactly makes a place liminal?


r/explainlikeimfive • • 18h ago

Biology ELI5 does water diffuse through a cell membrane only by passing through aquaporins?

4 Upvotes

Studying osmosis stuff for an exam, I thought water was able to slip through gaps in cell membranes, but a quiz question my professor posted said to cross the cell membrane water must pass through aquaporins.


r/explainlikeimfive • • 1h ago

Biology ELI5 Why do we not lose weight when our bodies are forced to exercise?

• Upvotes

Hello everyone. Why do we not have exercise machines which ‘force’ our bodies to exercise and therefore lose weight? For example, an exercise bicycle where the pedals are electronically turned moving the legs for you. Surely we are burning ATP and associated stores by the muscles moving? Thanks!