One Thing You Can Learn in 2 Minutes That Will Be Useful for the Rest of Your Life

In 430 BC, the second year of the Peloponnesian War, Greek general led a fleet of over 100 ships towards the enemy island.As they were charging ahead at full speed, suddenly, a solar eclipse cast the entire fleet into darkness.Unaware of the scientific nature of this unexpected and shocking event, panic befell the soldiers and sailors. But not .

He took off his black cloak, walked to the navigator of his ship, held it around his head and asked the man: Are you afraid of what you see?Looking at nothing but a piece of black cloththe man replied: No, of course not! countered: So what does it matter, if the cause of the darkness is a different one?When we dont understand something, our minds conjure the wildest, most sinister and dismal explanations. The result is fear and fear leads to bad decisions.But when we question our own perspective, we find we can often explain the fear away.

Perspective is everything.

The beauty in that is were free to change our perspective at any second.We can choose to try different angles of looking at any situation, to break it down into its parts, to look past it, around it or through it, until we find the perspective we need to move forward.Man does not simply exist but always decides what his existence will be, what he will become the next moment. By the same token, every human being has the freedom to change at any instant.Viktor FranklIf you pause for a moment to remember this story, itll be useful for the rest of your life.I myself first learned it from Ryan Holidays book, The Obstacle Is The Way, for which I wrote a summary here.

This article started as an answer on quora.com

·RELATED QUESTION

How to make a green LED as visually bright as a 0 magnitude star?

This is not a full answer, as I don't know how to compare an led with a candle, and I am not sure than the "answer" makes sense, even in rough estimate terms. Please just treat it as background and I will then delete it. Candle Study AbstractUsing CCD observations of a candle flame situated at a distance of 338 m and calibrated with observations of Vega, we show that a candle flame situated at 2.6 km (1.6 miles) is comparable in brightness to a 6th magnitude star with the spectral energy distribution of Vega. The human eye cannot detect a candle flame at 10 miles or further, as some statements on the web suggest.Wikipedia says, as you already know:A magnitude 1 star is exactly a hundred times brighter than a magnitude 6 star, as the difference of five magnitude steps corresponds to $(2.512)^5$or 100. But this does not make much sense either, especially when you go up another magnitude scale to mag 0.Comparing units of light power brings us back to the dark ages (sorry). One candlepower is the radiating power of a light with the intensity of one candle. This unit is considered obsolete as it was replaced by the candela in 1948, though it is still in common use. 1 candlepower is equal to about 0.981 candela. candela

The standard unit for measuring the intensity of light. The candela is defined to be the luminous intensity of a light source producing single-frequency light at a frequency of 540 terahertz (THz) with a power of 1/683 watt per steradian, or 18.3988 milliwatts over a complete sphere centered at the light source.

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According to R-Pi Troubleshooting with 7 flashes of the green led the kernel.img is not found. I do not have any experience with android things but in general the Raspberry Pi boot loader expects its boot files including the kernel image on the first partition of the SD Card. This partition must be formated with the FAT file system. So please check if this conditions are met. To compare, the boot partition of the official supported Raspbian Stretch Lite 2019-04-08 contains this files:Further information about the boot process you can find at Boot flow1. How much would people pay for a rainbow loom bracelets?2 or more2. Deep Purple, Rainbow, or Blackmore's Night?I am the man on the silver mountaiiiin3. How can a gay turn a rainbow into a icon for gay rights?"I have nothing against them" 4. Does Rainbow Table Not Require Decompression?No. The compression does not work like traditional RLE or LZMA style compression.Rainbow tables are, essentially, a lookup table which allows you to find a string given its hash. They are designed to be incredibly efficient at finding a hash in the index across billions of entries, while minimising disk space. Now, imagine you are building a table for lots and lots of strings. The hashes of some of these strings start with the same bytes - for example, "StackExchange", "ILikeWaffles9", "ILikeWaffles13507", and "Decompression242" when hashed with MD5 all start with 0xF2. Instead of storing all three hashes fully, you can construct a tree-like structure such that data looks like this:Note that the hashes are sorted by numeric order. In fact, since the first two strings also share the same second byte (0x17) these can also be chained:This also allows you to perform a lookup incredibly quickly - instead of having to search the full table, you only have to traverse the tree, and then search through a smaller list of hashes. Since the hashes are sorted, you can perform a binary search, which also has very good performance.As an example, if I have the hash f217f4a64e4036025c07b24a96ec787a, I look for the first tree node f2, then look to see if there's a sub-node for the second byte, 17. There is, so I continue down. I check to see if there's a sub-node for f4. There is not , so I now search through the list within the f2 -> 17 node. I know that f4 is likely to be near the end of that list, so I start there. I find that the hash matches the one I am searching for, so I now know that the plaintext is "Decompression242".It is also incredibly space-efficient when you've got millions or billions of hashes, because you do not duplicate parts of the hash that are shared with other plaintexts.EDIT: Sorry, I should have pointed out that this is not literally how rainbow tables work. This is just an example of how compression can work in this regard, without needing to actually save a full hash for each plaintext. I did not mean to imply otherwise. IMSoP's answer better describes the actual workings.The key thing to remember is that rainbow tables are only useful when you want to do multiple hash searches for that hash type. You generate a rainbow table for a particular string list or character list ahead of time, only once, and then you can use that generated data set as many times as you like. It's a trade-off of doing a lot of work ahead of time, so that your later searches are very fast.Another key thing is that any hash system which includes a salt automatically renders rainbow tables useless, since each password and salt combination should (ideally) be unique and long enough to make it impractical to build a rainbow table for every possible password and hash combination.
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