Passive Solar One Step Water Condensation has the potential to help provide clean drinking water for millions of people who are lacking access to clean water (or if they do, maybe the access is intermittent and they could use a plan B). This could save many lives for sure....durable, easy to transport (they stack easily), inexpensive to produce, and low-tech enough that it can be used even if no other infrastructure is present.
Photo: Watercone
Via Watercone