Recent comments in /f/explainlikeimfive
squidwards_noze OP t1_jeg3v6d wrote
Reply to comment by RhinoG91 in ELI5: Is there a time difference everywhere? by squidwards_noze
Would the different position of the sun not indicate a slight, but unacknowledged difference of time?
CautiousCold8392 t1_jeg3v46 wrote
Reply to comment by Chromotron in ELI5-What is the fibonacci sequence? by amsdys
>No, those are at best just any logarithmic spirals, the factor is not the golden ratio or otherwise Fibonacci-related.
It is true in some cases but not all. Even though there may not always be a connection between math and nature, there are still instances where the golden ratio and the Fibonacci sequence can be seen.
[deleted] t1_jeg3uin wrote
Muffinshire t1_jeg3oky wrote
wildfire393 t1_jeg3nog wrote
Reply to comment by CuriousHuman111 in ELI5: How do we continue to grow seedless fruit if they don't contain seeds? by CuriousHuman111
The trick they do with seedless watermelons is really neat.
Basically, they have strain A of watermelons that produces seeds. They take it, and make strain B by doubling up every chromosome. The chromosomal composition of B is the same as A, so the resulting plant behaves the same and still produces seeds. You can then make offspring plants with one A parent and one B parent, taking half the chromosomes from each - so it gets, for instance 15/30 from A and 30/60 from B. The resulting plant is still chromosomally equivalent to A and B, but it has an odd number of chromosomes - 45. So when it goes to create sex cells (which grow into seeds), it can't, because those require that the chromosomes be evenly split. So it grows fruit that are identical to A/B, but that don't produce seeds.
RhinoG91 t1_jeg3nbo wrote
Reply to comment by squidwards_noze in ELI5: Is there a time difference everywhere? by squidwards_noze
What? How did you come up with that?
No, the only difference is the position of the sun at any given instance in time. Google midnight sun or 24 hour darkness.
When it’s noon in one time zone, it’s noon everywhere in that time zone. Latitude has little bearing on the time. Our timekeeping is just to maintain a standard. Call someone in NorCal at noon and they’ll say it’s noon. Not 12:01. The sun would be lower in the sky compared to socal due to earth’s curvature, but “standard time” is just an agreed upon construct so we can all be harmonized.
fairie_poison t1_jeg3muz wrote
Heres a map of sunset times throughout the timezones of the US. you'll notice that the closer you get to the "border" of the next timezone west, without changing your clock, the later sunset it.
https://theconversation.com/the-hazards-of-living-on-the-right-side-of-a-time-zone-border-116630
thalassicus t1_jeg3f3k wrote
Reply to comment by dmazzoni in ELI5: If universities all teach the same things, how come some universities are perceived to be better than others? by Ok-Journalist-8751
If the metric is brand reputation and connections, top schools are great. If you need competency, it’s much more hit and miss. Up to 1/3 of all Harvard graduates have a legacy admissions component with many of them being untalented trust fund brats who are a disaster in the business world. We stopped hiring Ivy league MBAs after repeated issues vs someone who forged ahead on their own dime at grad school.
DarkAlman t1_jeg3du0 wrote
Reply to ELI5: The seemingly huge increase in Ticketmaster fee's and why there aren't competitors trying to cash in on the public backlash by undercutting them? by FIuff
Ticketmaster has been raising it's rates due to a combination of inflation and post-pandemic demand.
The cost of touring with a band has increased a lot, and many smaller bands just outright refuse to tour right now because it costs too much and they can't justify the ticket prices.
They also adapted a system of Dynamic ticket prices where rates change based on demand much like Hotels or Airlines do. So the more in demand a show, the higher the prices get.
Why aren't competitors undercutting them?
They are trying, but you can't really compete with Ticketmaster
Ticketmaster is a functional monopoly and also controls most of the venues so you can't compete with them. If you do they'll just buy you out or bury you.
Congress is long overdue to step in and enforce anti-trust laws again Ticketmaster
Hefty-Set5236 t1_jeg3aiy wrote
Time, as we track it, is our own invention. We get to say what time it is somewhere. Is the time different place to place when we compare where we are to the sun and moon? Yes. But we set the time zones, which we do hour to hour, so differences of minutes don't make a difference.
[deleted] t1_jeg351s wrote
MidnightAdventurer t1_jeg32az wrote
Reply to comment by defalt86 in Eli5 why does a survey need to have a minimum of 30 respondees to be statistically significant? by shashwathj
Sure, you obviously have a political point to make with your example...
My point was that in a conversation about statistical method, it is really important to make it clear that you need to be really careful that the statistics you collect and examine actually support the conclusions you make as this is a really, really common mistake
SpiralSuitcase t1_jeg321s wrote
Reply to comment by squidwards_noze in ELI5: Is there a time difference everywhere? by squidwards_noze
Yes, because Time Zones basically came around with the advent of the railroad. It was important that everybody agree on what time it is, otherwise it would be impossible to plan anything. The earth spins at a constant rate, meaning that the sun goes across the sky at a constant rate. It would just be completely impossible AND useless to split the entire world into, say, 1-minute time zones.
schoolme_straying t1_jeg2ui1 wrote
Each location has its own local time. This didn't matter for most of history.
Once we had trains there was a need to ensure that clocks were synchronised to ensure that trains departed at the same time for everyone concerned. These times meant there was a need to have standardised time over a large area.
WWI in Germany saw the need to make maximum use of available daylight in factories and this practice of daylight saving was quickly adopted in high latitude locations. In equatorial locations there is no point in daylight saving as sunrise and sunset don't vary much throughout the year.
DefenderNeverender t1_jeg2qmv wrote
Reply to ELI5: How does a DNR work? by HalloweenLover
One thing I'm not seeing mentioned here, and I think it's worth noting, is that if you put together any document like a DNR or a living will, it must be notarized before it can be considered legally viable. Just writing "do not resuscitate" on a piece of paper (over-simplifying but you get my point) is not going to mean anything if anybody tries to dispute it.
Best bet, go through a site like LegalZoom to get it put together if you can't afford a lawyer for a will-writing session, and make sure it's all wrapped up with a notary so you don't have to worry about someone making a decision on your behalf that you don't want.
MidnightAdventurer t1_jeg2p7s wrote
This comes back to a system of accounting called "double entry bookkeeping". Basically, whenever you have a transaction, it should affect at least 2 separate accounts e.g. a loan gets you $10k in cash, but adds $10k to your liabilities (debt) so overall, the loan hasn't changed your financial position because you'll have to pay it back later. This allows for a cross check to make sure you haven't missed anything in your accounts.
If you do a job on account (get paid later) you get income so you add this to your "sales" account as a debit (increase in assets) but I also need to show where this money is going so I credit my wages and inventory accounts to show that I no-longer have the materials I used and I have to pay my people. I also need to credit my profit account for the left over money. Now my debit (the sales revenue) balances the credit (what happened to that money). The money owed to me counts for accounting purposes as an asset equivalent to having the cash though we also need to track cash since I can't transfer that debt to my suppliers to pay my bills
Later, I get paid for the job so now my "sales" account is credited (reduced) because I am no-longer owed money but my "cash" account is debited (increased) as I now have the money in my hand / bank account. Again, my books still balance - since this was just collecting money owed, my overall position hasn't changed.
Balancing the books means going over all of your accounts and confirming that they all agree with each other. (Also see debits and credits)
DarkAlman t1_jeg2n73 wrote
Tracking time is entirely a human construct
There's no reason we can use a Universal clock for the whole planet. Technically we have that UTC or Universal Time, also called Greenwich Mean Time or GMT.
The problem is that people base their day on the time. Noon is when the sun is the highest, you go to work for 8am, etc
If you use Universal time noon would be in the evening in North America and people don't like that. Which is why timezones exist.
Timezones are kinda, not really, but mostly just lines drawn on a map that says "for this area the clock will be X hours ahead or behind GMT so that noon is when the sun is directly overhead"
Chromotron t1_jeg2aw4 wrote
Reply to comment by CautiousCold8392 in ELI5-What is the fibonacci sequence? by amsdys
> Natural examples include the spiral shapes of shells and galaxies.
No, those are at best just any logarithmic spirals, the factor is not the golden ratio or otherwise Fibonacci-related.
TheDeadMurder t1_jeg26cx wrote
Reply to ELI5:How electrecution happen at high voltage in near proximity without touching( HV lines). by ReferenceThin6645
Contrary to popular belief, electricity doesn't work like how most people believe it does, such as electrons don't move through the wire and circuits don't need to be connected to work, the reason this is taught is because that's the simplest way to explain it
What happens is that electrons are accelerated and dump their energy into protons, then accelerated again by the magnetic field that forms when a power source and load are in a circuit, if you have an electric toothbrushes, wireless chargers
than that's how they work without happening to having to be plugged into by a cable, that's also how transformers covert a high voltage to a lower voltage since the gap between them the two circuits are insulted by enough air to reduce the voltage enough
In most cases, the air is a good enough insulator that this isn't an issue, but once you get to a high enough voltage you do like with your example of high voltage lines or Tesla coils
Chromotron t1_jeg24iz wrote
Reply to ELI5-What is the fibonacci sequence? by amsdys
There are multiple ways to define Fibonacci numbers:
- Set the first two to be 0 and 1, and every after as the sum of those two preceding it: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ... .
- The number of different ways to form a strip of fixed length by glueing strips of lengths 1 and 2 together.
- The number of binary (only 0 and 1 allowed) sequences with a fixed number of digits, and 1s must not be consecutive.
- Via Binet's formula as ( φ^n - (-1/φ)^n ) / sqrt(5).
- [many more]
> how it it's supposed to be in all nature and that's sacres geometry...
That's a myth at best, and a lie at worst. There are some very few instances where they somewhat appear, but those are one in a million things. None of the claims of golden ratios appearing within humans, plants or animals has ever withstood scrutiny, sqrt(2), 1.5 and sqrt(3) are just as probable and nonsensical.
Edit: spelling.
BGFalcon85 t1_jeg21h8 wrote
Reply to comment by DestrucoMode in ELI5: If the chemical dopamine stimulates a 'feel good' sensation, is there a chemical that makes us angry? by Kree_Horse
Addictive chemicals just shortcut the process by dumping dopamine. It's the same mechanism that causes e.g. gambling addiction.
squidwards_noze OP t1_jeg20h6 wrote
Reply to comment by RhinoG91 in ELI5: Is there a time difference everywhere? by squidwards_noze
Okay so what you’re saying is there are indeed subtle differences and Northern California would have a tiny bit different time, but we just don’t acknowledge it?
jampbells t1_jeg2089 wrote
Timezones are used to track keep places/people aware of the same time for societal reason. They are split about roughly around how much daylight there is.
ADDeviant-again t1_jeg1wul wrote
They don't, and I've never heard one confidently say they did.
Educated guesses based on what they do know and what they think they know about behavior, anatomy, etc. are common and often proven right and proven wrong by later research.
Competitive_Thing_89 t1_jeg44kd wrote
Reply to ELI5: If the chemical dopamine stimulates a 'feel good' sensation, is there a chemical that makes us angry? by Kree_Horse
Amygdala seems to be related. Do not know if it release any chemical tho; >Charles Whitman lived a fairly unremarkable life until August 1, 1966, when he murdered 16 people including his wife and mother. What transformed this 25-year-old Eagle Scout and Marine into one of modern America’s first and deadliest school shooters? His autopsy suggests one troubling explanation: Charles Whitman had a brain tumor pressing on his amygdala, a region of the brain crucial for emotion and behavioral control. https://www.scientificamerican.com/article/how-responsible-are-killers-with-brain-damage/