Grow Organ­ic Food Eas­i­ly and Inex­pen­sive­ly The HAPI project has released a video demon­strat­ing the pri­ma­ry com­po­nents and oper­a­tion of a sim­ple hydro­pon­ic raft. The sys­tem is extreme­ly low-tech. It uses a sin­gle light and an air pump to grow 24 plants in 8′ sq. The raft takes about about $200 and 3 hours to build…