Recent comments in /f/explainlikeimfive
Moskau50 t1_iy4ob6f wrote
Reply to comment by CR1MS4NE in ELI5: why fish can’t breathe in air despite air having plenty of oxygen by CR1MS4NE
Air dries out and cannot support the fish's gills, causing them to collapse. Once they collapse, they aren't contacting nearly enough air to exchange enough oxygen to keep the fish alive.
Think of how seaweed or kelp in the water can use its buoyancy to stretch itself out, but once out of water, it's just collapses into a heap.
MrWedge18 t1_iy4o519 wrote
Reply to comment by Bet_the_Flop in Eli5: Why do laptops run more efficiently when connected directly to power? by Bet_the_Flop
Sometimes. If you got to power or battery related settings, there might be a way for you to ask for more performance instead of battery life.
[deleted] t1_iy4nxgb wrote
Reply to Eli5: Why do laptops run more efficiently when connected directly to power? by Bet_the_Flop
[removed]
CrazyMando t1_iy4nqq0 wrote
Reply to comment by [deleted] in eli5 How is computer memory deleted? by unlikemike123
Sledgehammer
Pretz_ t1_iy4npvr wrote
Reply to eli5 How is computer memory deleted? by unlikemike123
Say for example that when you get home from work, you put your wallet in a drawer and then write down on a piece of paper instructions how to find it. The following day, you throw away the piece of paper and forget where your wallet is. It's still technically there, but you can't find it; the wallet has been deleted.
Eventually you get a new wallet and need to put it somewhere. You open the drawer and see your old wallet there. It's irrelevant now, so you throw it out, put the new wallet in, and write down on a piece of paper instructions how to find it.
The wallet is a computer file.
EDIT: At least, this is the olde way of doing things. Looks like the youths have gone and made things all different and frightening.
Ahab_Ali t1_iy4nlqs wrote
Reply to comment by Scuka1 in ELI5: What do food product labels that say “whole wheat” or “100% whole grain wheat” mean? Are these better for health? by acousticentropy
While I would agree that the phrasing "using buzzwords to trick you" is a bit much, I believe the poster is essentially making the same point /u/ACMEPrinting did a little later. In the US, the FDA does not have any specific label requirements that differentiate "wheat flour" from "whole wheat flour" from "100% whole grain wheat". They make recommendations, but the manufacturer ultimately can use whatever language they want. The onus is on the consumer to check the nutrition label.
Bensemus t1_iy4nho4 wrote
An injury that leads to tons of blood loss is very traumatic for the body. A needle that extracts some blood barely registers. These aren't equivalent things.
People needing blood often need multiple transfusions as they are actively loosing blood. The transfused blood buys surgeons time to find and stop the bleed(s). A person donating blood is losing a controlled amount of blood that is safe to lose.
If you lose too much blood organs and tissue start to die due to lack of oxygen. We can't reverse this damage and depending on what died our body is also limited or incapable of repairing the damage too.
Transfusions try to maintain enough blood in the body so the heart and lungs or a bypass machine can keep your body saturated with oxygen. A person donating has no risk of this.
Your body can't just magic out liters of blood. Where would it come from?
Dr_Catfish t1_iy4n4m9 wrote
Reply to comment by Bet_the_Flop in Eli5: Why do laptops run more efficiently when connected directly to power? by Bet_the_Flop
On some laptops yes. On others, not without headaches.
marcw1771ams t1_iy4n40h wrote
Reply to comment by Bet_the_Flop in Eli5: Why do laptops run more efficiently when connected directly to power? by Bet_the_Flop
Not really these power saving features are applied at the BIOS level. There may be some settings you can tweak to push battery performance closer to what it is on mains power, but these will significantly reduce battery life.
Moskau50 t1_iy4mwnd wrote
Reply to Eli5: Why do laptops run more efficiently when connected directly to power? by Bet_the_Flop
Laptops generally have pre-installed power management software that can throttle performance to ensure good battery life. If you haven't changed any settings, the default will usually reduce performance any time it's on purely battery power, regardless of charge. The assumption being that, as a laptop, it's more useful to have 6 hours of operation at 50% performance than 2-3 hours at 100% performance. It can always take more time to get something done, but once the battery is low, you can't do anything.
However, if you're connected to an external power source, the laptop will generally assume that power is plentiful, so it will give you 100% performance as long as it can also charge the battery as it does so.
ClownfishSoup t1_iy4mkcj wrote
Reply to comment by goclimbarock007 in eli5 How is computer memory deleted? by unlikemike123
This weird thing happens with cake and cookie mixes as well. You can easily make a mix that just requires adding water and then baking, but people didn't believe they would be any good, so manufacturers changed the ingredients so that the end user has to add oil, milk and eggs to the mix. ie; people were suspicious that the mix was too easy, so they dumbed it down.
Bet_the_Flop OP t1_iy4miy1 wrote
Reply to comment by lollersauce914 in Eli5: Why do laptops run more efficiently when connected directly to power? by Bet_the_Flop
Gotcha. Can a user bypass this?
Quaytsar t1_iy4mh21 wrote
Reply to comment by Bensemus in ELI5: What does it mean by time slowing down at event horizon? by [deleted]
Yeah, I misread my graph.
lollersauce914 t1_iy4mehz wrote
Reply to Eli5: Why do laptops run more efficiently when connected directly to power? by Bet_the_Flop
The laptop underpowers its components when not plugged in to conserve battery life. That's really the long and short of it.
Mand125 t1_iy4m4i5 wrote
Reply to comment by pseudopad in ELI5: How are the Xray machines at airports not super dangerous? by Curious-Nothing6234
They used to have some backscatter x-ray machines for full body scanning at some airports because federal contracting rules required two sources for scanners.
Since then they’ve been removed because any dose of x-rays is worth avoiding when you have the millimeter wave scanners available.
entity102 t1_iy4lxj0 wrote
Reply to comment by Canadian__Ninja in ELI5: why fish can’t breathe in air despite air having plenty of oxygen by CR1MS4NE
Who says that I can’t
ClownfishSoup t1_iy4lt2f wrote
Reply to comment by nmxt in eli5 How is computer memory deleted? by unlikemike123
You are confusing "file storage" with "memory".
ie; harddrive, floppy disk, solid state drive storage versus RAM (Random Access Memory).
Most operating systems use a part of file storage for swapping out memory, yes, but that's not really what they OP is asking.
[deleted] t1_iy4loxs wrote
Reply to comment by ElAdri1999 in eli5 How is computer memory deleted? by unlikemike123
[deleted]
cordazor t1_iy4ljxg wrote
Reply to comment by Canadian__Ninja in ELI5: why fish can’t breathe in air despite air having plenty of oxygen by CR1MS4NE
Yes, that's well known. the op wants to know why. Read the question again
ClownfishSoup t1_iy4lj5a wrote
Reply to eli5 How is computer memory deleted? by unlikemike123
You may be confusing "memory" with "disk storage".
For memory, turning off power basically deletes all memory as it needs power to "maintain state".
For disk storage, deleting a file just means removing any reference to it, but leaving the contents on the disk as it's more work to "erase" the contents.
Imagine you have a large book like the Bible, and each story is a marked with a bookmark. "deleting" the file means just throwing the bookmark into the garbage. The text is still there, but there is nothing to point to it. If you write a new file, you put a new bookmark where there is space, maybe it's on top of the old one, then you just write over top of the old text. Overwriting the data changes it, it doesn't accumulate or anything.
Bensemus t1_iy4liea wrote
Reply to comment by Quaytsar in ELI5: What does it mean by time slowing down at event horizon? by [deleted]
They don't. GPS's go faster due to being farther from Earth.
> The combination of these two relativitic effects means that the clocks on-board each satellite should tick faster than identical clocks on the ground by about 38 microseconds per day (45-7=38)!
mr_oof t1_iy4l6oz wrote
Reply to comment by Sand_Trout in ELI5: Why is moon so full of craters but earth isnt. by Stoghra
Per #1: the Canadian Shield has some of oldest exposed rock on Earth, and has some huge craters- you just have to look really hard. Like, a large roundish lake with circle of small lakes on a satellite map, or a region of super-concentrated mineral deposits (both of which you see in the area around Sudbury, Ontario.)
pm_me_n_wecantalk t1_iy4l6n6 wrote
Reply to eli5 How is computer memory deleted? by unlikemike123
You know when you read a book, it has index of all of its chapters etc. files on hard disk are stored in similar way. There is an index which maintains which file is where.
When you delete a file, it’s entry is removed from the index. The file still exist but it can’t be located from index (which is used by all programs to locate files).
The file which still exist can be over written by others with new respective entry in index.
wtfsafrush t1_iy4l51t wrote
Reply to comment by Scuka1 in ELI5: What do food product labels that say “whole wheat” or “100% whole grain wheat” mean? Are these better for health? by acousticentropy
What is the benefit of processing the flour then? Does it not increase the cost of production? Does it have properties that make it better for baking?
Scuka1 t1_iy4oiji wrote
Reply to comment by wtfsafrush in ELI5: What do food product labels that say “whole wheat” or “100% whole grain wheat” mean? Are these better for health? by acousticentropy
I've never baked with whole wheat flour, but supposedly whole wheat baked stuff tends to be coarser, dryer, tougher, denser, and has a stronger flavor. All in all, supposedly it's more difficult to get a good bread out of whole-wheat flour. Generally, we want our breads to be light, soft, and fluffy.
Also, whole wheat flour has a a shorter shelf life.