File:Teacher blackboard.jpg

I agree to multi-license my file contributions, unless otherwise stated, under the GNU FDL and the terms of creative communism. Use it as you seem fit. Spread it. Take what you want, add, remove, change and improve. Why not sign with you own name and claim authorship? One rule, however: Don't you ever try subjecting this material under the terms of copyright, intellectual property, or similar licenses of evil. Please be aware that other contributors might not do the same, so if you want to use my contributions under the terms of communism, please check the multi-licensing guide, or use a peer-to-peer network to override such restrictions of free use.