When you hear people talk about alternative sources of energy and living off the grid, several things come to mind. The first thing that people think about is alternative energy sources like solar panels and wind turbines. Secondly, the cost. It seems that most people believe setting up these systems will cost an arm and a leg.

Zeno of Elea, a philosopher who lived from 490 to 430 BCE, studied under the famous Parmenides, another philosopher also from Elea. Zeno contributed much to history of western philosophy in addition to also providing a lot of insight to our modern fields of mathematics and science. Zeno’s importance rests in his comprehensive writing on motion and change but particularly on the concept of infinity. While most philosophers before him presupposed a notion of infinity without any hesitation, Zeno was the first in Western history to really expose the problematic nature of infinity.

Sleepers sofas have been around for decades. They were initially sought out by people who wanted to have an extra place for overnight guests to sleep. These sofas, therefore, served dual purposes as seating during the day and beds at night.