Backyard Water Rocket With a catch & release mechanism, you can get higher pressure--with significantly higher flights! This version will be safer, especially with small kids around. (Popular Mechanics)
I want to build this or my shop... Tool-O-Dex Plans: Build the Ultimate DIY Tool Rack Typical workshop pegboards are too small for a big tool collection. The solution? Take a cue from the office rolodex and build a Tool-O-Dex, a pegboard flip book that packs 64 square feet of storage into 8 feet of wall space.