Wow! A 15-year-old Canadian girl has invented a flashlight powered only by body heat. It turns on using the energy created by the heat of her palm, and nothing more. She's earned a spot in the Google Science Fair finals.
An aquifer is an underground layer of water-bearing permeable rock or unconsolidated materials (gravel, sand, or silt) from which groundwater can be extracted using a water well. The study of water flow in aquifers and the characterization of aquifers is called hydrogeology.