/u/General_Urist's posts

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first derivative of a curve equal to 0 indicates a minimum or maximum point. Second derivative equal to zero indicates a point of inflection. Does the third derivative being zero mean something as well?

6 upvotes • r/askscience

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How did pastoral nomadic people that historically lived in southern Ukraine and Russia deal with large rivers like the Dnipro bisecting their territory?

6 upvotes • r/AskHistorians

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My external hard drive comes with a warning not to store it at pressure of below 0.5 atmospheres. I understand that a cushion of air is needed in operation, but why would low pressure cause problems for just storage?

4 upvotes • r/askscience

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Given an operation that tells you the number of digits in a number in base-10, how many times would you have to iterate that operation on Graham's number to get a number that can fit in the Universe? Or is THAT number too big to fit as well?

2 upvotes • r/askscience

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Is it possible to make lead-acid batteries using an acid that isn't Sulfuric Acid? If so, how well would they perform?

2 upvotes • r/askscience

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How big a role, if any, did the proliferation of gunpowder cannons play in the decline of feudalism and the rise of modern centralized government?

2 upvotes • r/AskHistorians

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How come the yellow edges of a flame are so clearly defined? I understand that the yellow color is actually just the glow of heated carbon, but shouldn't that cause it to gradually taper off through dark red first?

1 upvotes • r/askscience

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If I put superheated graphite poweder (basically carbon) into a jar of pure hydrogen, what (if any) hydrocarbons would get created?

1 upvotes • r/askscience

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What are the main design differences between a coal-burning steam engine and a wood-burning one?

1 upvotes • r/askscience

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If asked to write out thew number of digits in the number of digits .... in the number of digits in Graham's number, how many times would "number of digits" have to be repeated for the answer to fit in A4 paper.

1 upvotes • r/askscience

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Title	Upvotes	Subreddit	Mark as read	Favorited	Rating	Add to a list
first derivative of a curve equal to 0 indicates a minimum or maximum point. Second derivative equal to zero indicates a point of inflection. Does the third derivative being zero mean something as well?	6	askscience
How did pastoral nomadic people that historically lived in southern Ukraine and Russia deal with large rivers like the Dnipro bisecting their territory?	6	AskHistorians
My external hard drive comes with a warning not to store it at pressure of below 0.5 atmospheres. I understand that a cushion of air is needed in operation, but why would low pressure cause problems for just storage?	4	askscience
Given an operation that tells you the number of digits in a number in base-10, how many times would you have to iterate that operation on Graham's number to get a number that can fit in the Universe? Or is THAT number too big to fit as well?	2	askscience
Is it possible to make lead-acid batteries using an acid that isn't Sulfuric Acid? If so, how well would they perform?	2	askscience
How big a role, if any, did the proliferation of gunpowder cannons play in the decline of feudalism and the rise of modern centralized government?	2	AskHistorians
How come the yellow edges of a flame are so clearly defined? I understand that the yellow color is actually just the glow of heated carbon, but shouldn't that cause it to gradually taper off through dark red first?	1	askscience
If I put superheated graphite poweder (basically carbon) into a jar of pure hydrogen, what (if any) hydrocarbons would get created?	1	askscience
What are the main design differences between a coal-burning steam engine and a wood-burning one?	1	askscience
If asked to write out thew number of digits in the number of digits .... in the number of digits in Graham's number, how many times would "number of digits" have to be repeated for the answer to fit in A4 paper.	1	askscience