DIY drip irrigation system: bury a milk jug with holes drilled in it next to your plants. Stick the hose in the top of the jug and fill with water. Also works for feeding: add a scoop of fertilizer into the jug and add water.
Pump Fire Drill - The Iroquois invented this ingenious pump drill, which uses a flywheel to generate friction. The crossbar and flywheel are made of hardwood; the spindle and fireboard are made from softwoods (as in the ha