```
"The noblest pleasure is the joy of understanding" - Leonardo Da Vinci
"If you can't explain it simply, you don't understand it well enough" - Albert Einstein
```

I don't know about others but when I started digging into machine-learning I had some problems understanding bias-variance until I found a nice target shooting analogy.
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## Historical volatility

### Trading

Historical volatility (also called realized volatility) measures how far the normal standard deviation is from expected mean, over a given period of time.
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## Whale alert

### Trading

Very simple pivot-point indicator that tries to detect whales' presence by checking the spikes in volume at the same UTC hour for the last 3 days.
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## Incomplete guide to Options Greeks

### Finance

Greeks or Options Greeks are tools/statistics which measure sensitivity (responsiveness, calculus anyone?) of option price to changes in various parameters: underlying price, volatility, time, etc…
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## Black-Scholes formula

### Finance

Black-Scholes formula… maybe not as important and well-known as compounding interest-rate but still the most famous formula among options traders.
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## Year 2020

### Review

Pam, pam, pam !!!
Bloody fucking year, 2020, one of a kind, already in history books.
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## Ternary (trinary) vs. binary

### Computers

We all know the binary system but a few heard about ternary (trinary) system; one of the first computer in Soviet Russia was using ternary system but it went out of fashion and binary system took over.
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## Generate IOTA address

### IOTA

Generate IOTA address using plain old Python, starting with random seed, derive private key, and finally the checksum and address.
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## Interest rate

### Finance

Albert Einstein: "Compound interest is the eighth wonder of the world. He who understands it, earns it … he who doesn't … pays it.
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## Algebraic structures: Set, Group, Ring

### Math

The easiest way to understand algebraic structures, starting with basic structure called Set and incrementally add properties on top of it to build more complex structures.
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