Recent comments in /f/explainlikeimfive

kinyutaka t1_jaci27d wrote

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.

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TehWildMan_ t1_jaci0gh wrote

> 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

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Target880 t1_jachu1t wrote

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.

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ScienceIsSexy420 t1_jachoww wrote

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

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usrevenge t1_jachcox wrote

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

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Gnonthgol t1_jacgveb wrote

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.

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SoppingBread t1_jacfvmr wrote

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.

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ScienceIsSexy420 t1_jacfs9r wrote

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

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A_Meal_of_Pain t1_jacfphh wrote

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.

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