Interesting knowledge I learned today.

There are two ways your knife can get dull: 1) The blade wears down or 2) The blade's edge is not aligned properly.

The sharpening pole is not actually a sharpener, it's what's called a "honing steel". The tool doesn't actually sharpens the knife - its function is to re-align the blade so it's straight again.

The author wrote a program that solves Mario levels by exploring the state space with a path-finding algorithm with a guiding heuristic. This is a nice demo of how you sometimes don't need sophisticated algorithm or machine learning to tackle complex problems.

A series of courses to get your hands wet (dry?) on learning electronics. Ben Eater style.