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If we only bought things we needed, there would be enough for everybody. What do we need? A coat? A mobile phone? What you need depends on how old you are and your way of life.
"I come from the south of England, in the most densely-populated corner of a small island, which, you might think, is full of people."
Sojourner Truth. The name Sojourner may be familiar to you. It was the name of the wheeled robot that was sent on the expedition to Mars in 1997 to explore the surface of the planet.