Make: Compressed Air Rockets Kit

Building this rocket launcher is a breeze, and folks are always amazed at how it shoots reusable paper rockets 200–300 feet high. The launcher is made from PVC pipe. You pressurize its chamber to 75psi with about 18 strokes of a bicycle pump, then release all the pressure in a... Read more »

Jellyfish Tank

A tank of healthy jellyfish is hypnotically beautiful. Unfortunately, jellies can’t live in a regular aquarium because they get sucked into the filtration pumps or trapped in “dead spots” at the edges. This special design creates a laminar flow that keeps jellies safely suspended in the middle of the tank. Read more »