Purificar agua con arena y semillas Científicos de la Universidad Estatal de Pennsylvania han encontrado un método barato para depurar agua con un extracto de las semillas de la planta Moringa oleífera
A molecular genetics study confirms that humans first evolved into nearly hairless beings nearly 1.5 to 2 million years ago to sweat excess body heat and then used skin for self expression! Earlier, some researchers had believed that humans evolved to be hairless, similar to whales and dolphins, due to a common ancestor with whales and dolphins. The photo is a 10x magnification of the human skin dermis that has been tattooed. The black spots indicate tattoo ink.