Just looking at several posts below and thinking of the countless little helpful things there are to learn when it comes to machining, fabrication, welding/soldering, casting, heat treating, material properties, woodworking, mechanics etc. for the tinkerer in his garage.
I consider myself only an average shade-tree craftsman, even though the first time I cranked a handle on a lathe was about 35 years ago. I've been making a living in manufacturing work for about 25 years now, and I know I've only scratched the surface when it comes to knowledge of the trade.
So If you've learned something, edjumucate others by sharing it!
I'll start - What material has zinc as a major alloying element, brass or bronze?
Answer - Brass. Easy way to remember this is that bronze has the letters "NZ" - No Zinc.
(Disclaimer - The above is only a rule of thumb for modern materials - Many copper alloys that have historically been called bronze did/do in fact have a significant percentage of zinc in them. For example, "Naval Brass" (464) is often referred to as "Tobin Bronze", but is actually in the brass class)