Ball bearings will be used for many years to come, because they are very simple and have become very inexpensive to manufacture. some companies experimented with making balls in space on the space shuttle. in space, molten blobs of steel can be spit out into the air, and the zero gravity lets them float in the air..
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Enjoy hours of free boatbuilding video content, including this 14-part how-to that takes you through a stitch-and-glue kayak kit from start to finish. dozens of videos on strip-planked kayaks are here, and most boat pages have engaging intro videos like this one. on this site you will find not just boat kits and plans but boatbuilding materials, marine plywood, boatbuilding tools, mas epoxy.