Stumbled on: Cheat Sheets every IT should have

As usually on any given Sunday, stumbling upon while downloading stuff and preparing dinner sometimes leads to find hidden internet gems like the shown below... that's why I decided to create a post event on every Sunday called "Stumbled on".

 Cheat Sheets every IT should have

First stumbled by Kingrm.
Source: Packetlife.net cheat sheets

CISCO IOS interior Routing Protocols, taken from link above

A comprehensive collection of cheat sheets with a nice wall poster (90x60 cms) size print and available in .PDF format.

Enjoy!

A water doplet maze too hot to be true

First stumbled upon this Here.

The Leidenfrost effect is one of my favourite physics effects, daily present in common things as a droplet of waiting failing on a hot pan, it can be driven to cool experiments like this one done by undergraduate students from Bath University.

When a liquid comes in contact with a surface twice as hot the liquid's boiling point, the liquid never touches the surface: a vapor barrier prevents the two from touching. If the surface has saw-tooth like edges, the doplet will move as shown below.