Black Friday is still weeks away, but I've been searching the web looking for the best gadgets that make great gifts, and I've found some cracking deals for you.

Physics and Python stuff. Most of the videos here are either adapted from class lectures or solving physics problems. I really like to use numerical calculations without all the fancy programming ...

A multimeter might look intimidating, but learning to use this simple electrician's tool will come in handy during a number of every day tasks.

A simple internet speed test can tell you a lot about your home's network and whether you're getting your money's worth. We'll show you how to run one and more.

Understand what the current ratio measures, why it matters, and how to use it to assess and improve short-term liquidity.