Low-cost solar-powered water purifier developed by students of University of Washington

Using solar energy to purify water isn't new. But it's quite costly. And the good news is now that some students from University of Washington have managed to develop a low-cost solar-powered water purifier. And their water purifier can retail at just $3.40 which is definitely a handy gear that will help many parts of this world suffering from shortage of clean drinking water.

Hydroleaf Shelter, solar-powered bus stop, collects and purifies water

It's a solar-powered bus stop which also doubles up as a device that collects water and purifies water for villages that're short of clean drinking water.