Recent comments in /f/explainlikeimfive
PerturbedHamster t1_je5ft8b wrote
Reply to ELI5: How do physicists know that their search for a Grand Unified Theory (GUT) is even achievable? by spearblaze
This article lays out some of the reasons why we think there might be one. Also, we've seen unification happen in the past. First, electricity was linked to magnetism by Oersted when he noticed that an electric current made a compass move (I believe he actually noticed this during an in-class demonstration). Until then, there was no reason to think that static electricity had anything to do with compass needles pointing north. Then, EM was united with the weak force at high energy back in the 70's. There are indications (more details in the article) that there are some strange coincidences in various values for strong, weak, and EM strengths/gauge groups that hint at the three forces becoming one at energies 10^15 times the mass of the proton.
An imperfect but perhaps useful analogy is the Higgs boson. Even though it had never been seen, a lot of stuff made a lot more sense if the Higgs existed, which is why we spent billions of dollars building the LHC, and indeed the Higgs was there.
ChicagoBeerGuyMark t1_je5faid wrote
Reply to comment by chton in eli5 why ancient historical buildings haven’t been kept up? Why are buildings like the Parthenon and the Colosseum in such disrepair? Greece and Rome/Italy have existed the entire time? by PickledSpace56
Much of the restoration would be to preserve things as they exist now, and to keep them from decaying further and falling in on tourists.
the_original_Retro t1_je5ex3m wrote
Reply to comment by Water-Cookies in ELI5: How does your stomach "know" when to pass food on if more food keeps entering during initial digestion? by Water-Cookies
This is where my knowledge fails, but I think it's safe to say that different chemical and filtration processes activate between different classes of in-taken nutrients including water, and these are handled by different organs in the body.
The intestines do much of the work of digestion for more complex molecules, giving those molecules time to be broken down into protein building blocks, and simplifying starches into sugars. But if you drink a couple big glasses of water, most of that water never reaches the full path through them.
ChicagoBeerGuyMark t1_je5etut wrote
Reply to eli5 why ancient historical buildings haven’t been kept up? Why are buildings like the Parthenon and the Colosseum in such disrepair? Greece and Rome/Italy have existed the entire time? by PickledSpace56
In the town of Xanten, Germany, there's an "archaeological park" (Archäologischer Park Xanten) at an old Roman fort. Most of what's left are stone columns and foundations that had minimal restoration to keep them from falling apart further, but they rebuilt much of the town as a great educational attraction. It's also my understanding that many of the great stone edifices were, upon the fall of their empires, pillaged for building materials and road paving. The Goths didn't really have historic preservation on their list of priorities.
nerdguy1138 t1_je5ekl5 wrote
Reply to comment by bulbaquil in ELI5: If digital data is stored in 0s & 1s, how does the reader know how many of the digits to take into consideration? by distinct_oversight
The gnu file utility can read the first few bytes of a file as a magic number to determine what kind of file it is.
There is a hacker magazine called POC or GTFO, meaning proof of concept.
The PDFs of that magazine can also be interpreted in various other ways. Files that you can do this with are called polyglots.
Magneto88 t1_je5eb8n wrote
Reply to comment by Eric1491625 in eli5 why ancient historical buildings haven’t been kept up? Why are buildings like the Parthenon and the Colosseum in such disrepair? Greece and Rome/Italy have existed the entire time? by PickledSpace56
The Ottoman Empire was the universally recognised legal authority for Greece at the time. Ipso facto it was legal. Like I said, whether you morally agree with the position and whether Greece should have been ruled over by the Ottomans is another matter. It was however legal at the time the deal was done and the marbles were acquired legally.
Dbgb4 t1_je5dbjv wrote
Reply to eli5 why ancient historical buildings haven’t been kept up? Why are buildings like the Parthenon and the Colosseum in such disrepair? Greece and Rome/Italy have existed the entire time? by PickledSpace56
Many of these places are zones of historical conflict and that is a cause. Rome defeats Carthage and tears the place down, that in ancient times. Several sieges in documented historical times cause much damage to the Parthenon, and other sites.
ThePKNess t1_je5d8x5 wrote
Reply to comment by phiwong in eli5 why ancient historical buildings haven’t been kept up? Why are buildings like the Parthenon and the Colosseum in such disrepair? Greece and Rome/Italy have existed the entire time? by PickledSpace56
I think this answer, whilst partially correct, kind of misses the bigger picture. Medieval and Modern societies did have the resources for this kind of monumental building. maybe not as many but they certainly did. They just used those resources building things that were useful to those societies, namely churches and cathedrals. The later Middle Ages and Early Modern period saw a massive expansion in the construction of monumental structures like Notre Dame or Cologne Cathedral. As admired as the Romans were the were admired by Medieval and Early Modern people for their vast empire and Christian piety. Pagan temples and arenas for blood sports had largely gone out of fashion before Rome even fell, what purpose would later people have to maintain those ruins?
So whilst you are correct that later societies couldn't marshal the same resources for monumental constructions as the Romans could, it is not really the most significant factor in my estimation.
Cycleguy57 t1_je5d330 wrote
Reply to comment by Abba_Fiskbullar in eli5 why ancient historical buildings haven’t been kept up? Why are buildings like the Parthenon and the Colosseum in such disrepair? Greece and Rome/Italy have existed the entire time? by PickledSpace56
Thanks for that. I know that the original outer limestone casing on the pyramids were stripped away.
FreeQ t1_je5cy5c wrote
Reply to comment by ave369 in eli5 why ancient historical buildings haven’t been kept up? Why are buildings like the Parthenon and the Colosseum in such disrepair? Greece and Rome/Italy have existed the entire time? by PickledSpace56
Ironically by making some of them into churches they gave us the best preserved examples of Roman architecture
Abba_Fiskbullar t1_je5coml wrote
Reply to comment by Cycleguy57 in eli5 why ancient historical buildings haven’t been kept up? Why are buildings like the Parthenon and the Colosseum in such disrepair? Greece and Rome/Italy have existed the entire time? by PickledSpace56
Almost all of these structures were used as a source of building materials. The most obvious is the marble cladding from the exterior, and bronze ceiling from the portico of the Pantheon. The marble cladding was stripped by lime burners in the middle ages, and the bronze ceiling from the portico was stripped and melted down by Pope Urban VIII in the 1600s. The main temple of the Parthenon complex was largely intact until 1687, when the gunpowder magazine stored there by the Ottomans was hit by cannon fire from the Venetian Navy and exploded.
venom121212 t1_je5bzlj wrote
costplusdrugs.com is where it's at though.
-a satisfied customer who still thinks it's too good to be true
I touched a bit on how it works here but the comments probably buried it:
Everry1146 t1_je5bqe3 wrote
Reply to comment by Theborgiseverywhere in eli5 why ancient historical buildings haven’t been kept up? Why are buildings like the Parthenon and the Colosseum in such disrepair? Greece and Rome/Italy have existed the entire time? by PickledSpace56
It was mostly intact until 1687. The Ottoman Empire controlled the city and was using it to store gunpowder.
PM_ME_YOUR_THEORY t1_je5bm7k wrote
Reply to ELI5: How do physicists know that their search for a Grand Unified Theory (GUT) is even achievable? by spearblaze
They don't know. It's a belief based on what they take to be the structure of the Universe. It's debated topic within Philosophy of Physics and even within physics itself.
This belief comes from the fact that everything, so far, seems to be describable and connected mathematically. The problem is that in recent years we have seen that the physics that describe the nature of the very small seem to be different from that of the very big. This means that either i) we simply haven't found a way to connect both properly; ii) it isn't possible to connect both properly; iii) the fundamentals of our understanding of the universe are still somewhat incomplete.
Water-Cookies OP t1_je5bbm7 wrote
Reply to comment by the_original_Retro in ELI5: How does your stomach "know" when to pass food on if more food keeps entering during initial digestion? by Water-Cookies
So, when you chug water during your meal, the stomach "knows" to pass that on faster, even though it's now mixing with the chyme and potentially creating a diluted concoction?
It makes sense that liquids are processed faster, it must just have to do with receptors in the stomach recognizing that there is water present and to just let it pass, for lack of a better analogy.
Water-Cookies OP t1_je5azn6 wrote
Reply to comment by EkbyBjarnum in ELI5: How does your stomach "know" when to pass food on if more food keeps entering during initial digestion? by Water-Cookies
Fit a square peg into a round hole. Interesting, I wonder if the stomach just only allows the chyme to pass, and everything else just keeps mixing until it's broken into chyme
explainlikeimfive-ModTeam t1_je5avsg wrote
Reply to ELI5: How do physicists know that their search for a Grand Unified Theory (GUT) is even achievable? by spearblaze
Your submission has been removed for the following reason(s):
Loaded questions, and/or ones based on a false premise, are not allowed on ELI5. ELI5 is focuses on objective concepts, and loaded questions and/or ones based on false premises require users to correct the poster before they can begin to explain the concept involved, if one exists.
If you would like this removal reviewed, please read the detailed rules first. If you believe this {kind} was removed erroneously, please use this form and we will review your submission.
Chadmartigan t1_je5atfg wrote
Reply to ELI5: How do physicists know that their search for a Grand Unified Theory (GUT) is even achievable? by spearblaze
They don't, and GUT theorists have been struggling to find experimental confirmation for a long time.
That said, the standard model is incomplete in ways that GUTs might address, and that keeps the dream alive.
Water-Cookies OP t1_je5at77 wrote
Reply to comment by phryan in ELI5: How does your stomach "know" when to pass food on if more food keeps entering during initial digestion? by Water-Cookies
That makes sense, I just don't understand how the stomach knows when it's acceptable to pass food on, and how, if other food enters at the same time.
[deleted] t1_je5ajpf wrote
jakeofheart t1_je5aes4 wrote
Reply to eli5 why ancient historical buildings haven’t been kept up? Why are buildings like the Parthenon and the Colosseum in such disrepair? Greece and Rome/Italy have existed the entire time? by PickledSpace56
For the same reason the US infrastructure is falling apart: the funds to maintain the constructions are no longer made available.
[deleted] t1_je5aei4 wrote
phiwong t1_je5a9hw wrote
Reply to ELI5: How do physicists know that their search for a Grand Unified Theory (GUT) is even achievable? by spearblaze
They don't. It is how science works.
There are gaps in our theories where they don't meet up to suggest that these current models are incomplete or insufficient. There is no clear signpost that ever says "you've got it all". So new models and theories are developed and new experiments are made.
Some theories we definitely don't have the experiments to test (today). So they might remain unconfirmed for a while yet.
And even if a "next step" is ever found, there is no guarantee that these next steps don't point out even more things to discover.
apple_cheese t1_je5ftuy wrote
Reply to comment by Akalenedat in eli5: How does GoodRX (or any prescription savings group) work? by fourtwenny2389
So close to universal health care "hey drug company, we want you to provide an entire countries worth of people with drug X give us a discount or we'll go to the competition"