10 Example Questions votes newest recent 11Blacksmithing: Does a coal- or wood-fired forge impart any qualities to the metal that a gas-fired forge does not? 10Blacksmithing: Can an electric kiln (such as for firing ceramics) be used as a forge to melt metals for casting? 11Blacksmithing: How much cleaning / prep is required to melt down aluminum cans for casting aluminum? Will impurities be a problem? 4Chemistry: How does soap make dirt/oils wash away in water? 5Chemistry: Why is alcohol often a better solvent for organic compounds than water? 22Chemistry: Why does 1 cup of water + 1 cup of alcohol produce less than 2 cups of solution? 1Chemistry: What are the basic safety rules for storing chemicals at home, garage, classroom, etc.? (Is it OK to store X in the same cabinet as Y?) 2Chemistry: What is the chemical process used to refine raw (brown) sugar to produce white sugar? 43D Graphics: What techniques should I use (or avoid) to keep my solid models “water tight”? 13D Graphics: How can I check that my model is a “water tight” solid in [application]?