References: Diffie-Hellman key exchange, quartz watch

Hello friends! I want to open a new category at my blog with this post. I called it "References".
I will regularly publish under "References" category several references to various interesting videos, articles, books, etc. There will be no cute kitties pictures :-), only several cherry-picked materials about art, technology, science, etc. Let's get started!

1. Public Key Cryptography: Diffie-Hellman Key Exchange
In this video you will find a visual explanation and demonstration of Diffe-Hellman key exchange algorithm. Imagine that you need to establish an encrypted communication between agent A and agent B over the public channel. After watching this video you will know how to do it!

2. How a quartz watch works
Engineer William S. Hammack explains the amazing nature of the quartz watches work, and how it can be so reliable, precise and cheap at the same time!