Dealing with risks associated with failure modes in projects and processes is part of normal business activity. However, when is a risk acceptable? By evaluating the impact and likelihood of the ...

[Suikan] has taken one of these plentiful models and done something special for it, creating a new mainboard, and a firmware which transforms it into a reverse Polish, or RPN, scientific calculator.

This is a calculator which uses Reverse Polish Notation, or RPN. A full write-up in Japanese (Google Translate link) carries an impressive level of detail about the project, but in short ...