Two news: Movies UNDERWATER SAIL and HELP DURING FLOODS

patrz http://www.youtube.com/watch?v=bNMW-jRoseo Method of operation boat’s propulsion type UNDERWATER SAIL you can watch on YouTube patrz http://www.youtube.com/watch?v=rgF82YB9XPw Method security during floods, you can watch on YouTube on the movie HELP DURING FLOODS, polish title NA RATUNEK POWODZIANOM patrz http://www.youtube.com/watch?v=ILSz5hoQtl0 Lifting blocks to Egyptian pyramids by Herodotus you can watch on YouTube on the movie ANCIENT MACHINES - PYRAMID BUILDING BY HERODOTUS patrz http://www.youtube.com/watch?v=JUPB4csc0tU Ancient machine named CYLINDER DIFFERENTIAL you can watch on YouTube on the movie polish title WALEC RÓZNICOWY patrz http://www.youtube.com/watch?v=aY7ZwgkIGQM Ancient machine named LEVER DIFFERENTIAL you can watch on YouTube on the movie polish title DŹWIGNIA RÓZNICOWA