Recent comments in /f/explainlikeimfive
TehWildMan_ t1_jaci0gh wrote
Reply to comment by Phage0070 in Eli5 why do stairwells need to be have two flights in a spiral to go up one floor when escalators can just use the one flight going straight up for the same distance? by exmxn
> An escalator can't make such turns so they need to be straight,
Side note, curved escalators can be made, but they're very expensive (I've never seen one outside of Las Vegas) and take up a huge amount of floor space in comparison
Flamesmith47 t1_jachz2l wrote
Reply to Eli5 why do stairwells need to be have two flights in a spiral to go up one floor when escalators can just use the one flight going straight up for the same distance? by exmxn
In case of emergency. Depending on where you live there is usually building code. Steps that are 8in high are standard for fire escape routes. Instead of making the stairs twice as steep, they create a turn.
Target880 t1_jachu1t wrote
Reply to ELI5: What's hard about copying photosynthesis or just using plants for power by No_Dust_5360
The max theoretical efficiency for photosynthesis is 4.6% for C3 and 6% C4 plants, that is of incoming sunlight.
Cheap solar panels, the type used for example on building roofs have a practical efficiency of around 20%. The most efficient but a lot more efficient are 47% efficient, they are used on for example satellites. The max theoretical efficiency is 86%
So we have already lowe cost solar panels that are over 3x as efficient as the theoretical efficiency for plants. Copying photosynthesis is not a good idea for efficiency because we already have more efficient technology.
Plants have the advantage the grow from seeds and do not need to be made in a factory. They also produce sugar chains that are stable molecules we can extra energy from later. There is no need to copy plants we can just use plants and harvest them as an energy resource.
Energy forestry is something that is done. Humans have done it for centuries by letting trees grow used for firewood.
exmxn OP t1_jachqkk wrote
Reply to comment by Phage0070 in Eli5 why do stairwells need to be have two flights in a spiral to go up one floor when escalators can just use the one flight going straight up for the same distance? by exmxn
This actually makes a lot of sense hahah thank you!
TheDefected t1_jachpvk wrote
Reply to comment by bulksalty in eli5 What is the purpose of those little “I am not a robot” buttons. Can a robot seriously not detect and click them? by Lord-Zippy
There was an older one you don't see anymore where they showed you blurred text, that was from character recognition from scans of old newspapers that google was adding into their database and couldn't make out.
ScienceIsSexy420 t1_jachoww wrote
Reply to comment by [deleted] in ELI5: What's hard about copying photosynthesis or just using plants for power by No_Dust_5360
Photosynthesis absolutely is a means for generating energy, plants use the energy created to fuel the creation of sugar molecules which are then later break down for food. The starches created by plants during photosynthesis can only be created with the energy from the sunlight. Saying photosynthesis doesn't generate energy is pretty ridiculous
Phage0070 t1_jachm9j wrote
Reply to Eli5 why do stairwells need to be have two flights in a spiral to go up one floor when escalators can just use the one flight going straight up for the same distance? by exmxn
They don't need to be two flights but they take up half the footprint that way making them much easier to fit into a design. An escalator can't make such turns so they need to be straight, making them a bit awkward to plan around.
[deleted] t1_jachl7p wrote
Reply to comment by No_Dust_5360 in ELI5: What's hard about copying photosynthesis or just using plants for power by No_Dust_5360
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ScienceIsSexy420 t1_jachhxh wrote
Reply to comment by NameUnavail in ELI5: What's hard about copying photosynthesis or just using plants for power by No_Dust_5360
It's not about making GMO plants, it's about making solar cells with the highest efficiency possible. The most efficient means we have discovered in the entire universe can for converting sunlight into electric energy is photosynthesis, so why wouldn't we try and emulate that?
usrevenge t1_jachcox wrote
Reply to ELI5: How can a 100GB game get an 80GB update and still be about the same size afterwards? by MissAJHunter
It's replacing data not adding new data.
But also depends on the game and system.
For example the first year of the ps4 the system couldn't insert data so if a game had a 50gb update then a week later got a 1gb update. It had to download all 51gb that week.
This changed later on but it's what caused the "copying" which took forever on ps4.
Some games like fallout 76 and kingdom come deliverance structured their files such that if a few things were updated a larger chunk also had to be reinstalled. That is why both games had day 1 patches the size of the game itself
Gnonthgol t1_jacgveb wrote
Reply to ELI5: How can a 100GB game get an 80GB update and still be about the same size afterwards? by MissAJHunter
The 80GB update is replacing 80GB of the existing 100GB game. For example if they update the skin of a character the new skin would replace the old skin, there is no reason to keep both the old and new skin. So the updated file containing the skin of the character would not change size. There would still be only one skin with the same resolution there.
[deleted] t1_jacgpl6 wrote
NameUnavail t1_jacgovo wrote
Reply to ELI5: How can a 100GB game get an 80GB update and still be about the same size afterwards? by MissAJHunter
If the update is to existing assets, the old version will just be removed.
E.g. if they changed the colour of an object, they can just delete the old texture file and just keep the new one
No_Dust_5360 OP t1_jacglli wrote
Reply to comment by [deleted] in ELI5: What's hard about copying photosynthesis or just using plants for power by No_Dust_5360
Would it be possible to somehow genetically modify plant's to not use all their power for the following processes and extract the power in some way?
mytrickytrick t1_jacgeu1 wrote
Reply to comment by NameUnavail in ELI5: What's hard about copying photosynthesis or just using plants for power by No_Dust_5360
It could be the next gen pickup line: "hey cutie, I see your cell phone is low on battery. Here's my charger and a flower for you"
Murdercorn t1_jacgef9 wrote
Reply to comment by ScienceIsSexy420 in ELI5: Why is it that if I want my shower to be warmer, if I turn the cold-water knob to the right (closer to off), the water in the shower gets significantly colder for about 30 seconds, then MUCH colder for about 5 seconds, then super hot? Why would closing the cold water make it colder? by [deleted]
That doesn’t explain why it gets colder for a while when I turn off the cold water.
Murdercorn t1_jacgar6 wrote
Reply to comment by A_Meal_of_Pain in ELI5: Why is it that if I want my shower to be warmer, if I turn the cold-water knob to the right (closer to off), the water in the shower gets significantly colder for about 30 seconds, then MUCH colder for about 5 seconds, then super hot? Why would closing the cold water make it colder? by [deleted]
But the water has already been running. I’m trying to get it to go from hot to hotter, so I turn off the cold but then it gets colder.
NameUnavail t1_jacg7ui wrote
Reply to comment by ScienceIsSexy420 in ELI5: What's hard about copying photosynthesis or just using plants for power by No_Dust_5360
Yeah I think engineering more efficient solar might be a better investment than trying to GMO a plantable phone charger....
[deleted] t1_jacg3a6 wrote
Reply to ELI5: What's hard about copying photosynthesis or just using plants for power by No_Dust_5360
[deleted]
SoppingBread t1_jacfvmr wrote
Reply to eli5 What is the purpose of those little “I am not a robot” buttons. Can a robot seriously not detect and click them? by Lord-Zippy
Images are used for supervised AI training. "Select all crosswalks" is used to help their AI to identify crosswalks, likely quality assurance for some driving algorithm. They detect you as human because the mouse takes a path that is recognized as human (doesn't jump directly to image position, has arc, has varied response time, etc.), not because you made the right selection.
So congrats, you work for Google.
ScienceIsSexy420 t1_jacfutf wrote
Reply to comment by A_Meal_of_Pain in ELI5: What's hard about copying photosynthesis or just using plants for power by No_Dust_5360
This question is about replacing photovoltaic cells with photosynthesis as a means of generating electric currents. They're not asking about combusting plans to generate electricity
ScienceIsSexy420 t1_jacfs9r wrote
Reply to comment by NameUnavail in ELI5: What's hard about copying photosynthesis or just using plants for power by No_Dust_5360
Plants have been doing photosynthesis and harvesting sunlight energy for far longer than humans have. They are significantly more efficient at doing so than humans are, and it is very much a goal worth pursuing. Our best solar cells are currently around 20-23% efficient, implants are far more efficient than this. More efficiency means more electricity generated
A_Meal_of_Pain t1_jacfphh wrote
Reply to ELI5: What's hard about copying photosynthesis or just using plants for power by No_Dust_5360
For thousands of years plants were our primary source of power in the form of burning wood. It was even the primary source of power at the beginning of the industrial revolution.
The reason it phased away as a source of industrial level power is because it just is not concentrated enough. That and the fact that extracting it has so many negative side effects for the environment.
kinyutaka t1_jaci27d wrote
Reply to ELI5: What's hard about copying photosynthesis or just using plants for power by No_Dust_5360
I think that the biggest problem with trying to use plant-based photosynthesis for electrical power generation is that photosynthesis is the creation of sugars through the combination of CO2 and water, utilizing energy from the sunlight.
Those sugars are great for animals to produce heat energy, but not good at generating electricity directly.
Meaning, we would need to translate the sunlight into sugar, then use the sugar to generate one kind of energy, then use that energy to generate power. Each step involves a decrease in efficiency.
Plants overcome that efficiency issue by growing larger and taller, to get more sunlight. Animals overcome that issue by eating more plants or eating more plant-eaters.
Photosynthetic power plants would have to become exponentially larger to overcome three or more steps of inefficiency.