Melamine foam (magic eraser / magic sponge) is a great cleaning tool using no chemicals, but it has a hidden danger.
Find out what big numbers feel like. Why is 2^128 so different to 128^2? In mathematics, as in many disciplines, concepts are very important. It's important to develop a feel for numbers.
How to paint a door. There are some special tips how to do this. It's best to do it in the right order and always prepare the surface properly.
In ancient China, craftsmen used skimmed milk and rennet with a little lime to produce a very good water resistant glue. You can do something similar using just skimmed milk and vinegar.
Palo Alto's Next Generation Firewall is described in detail.
The three pillars of security are: Confidentiality, Integrity and Availability. It's like a three-legged stool. If you remove one, then the whole is unbalanced.
This article tells you almost everything you need to know about sanding.