Life
From Slackerpedia Galactica
Life is a mystery, nobody can successful define Life without introducing science. Well here comes the science: basically Life as we know it only can only exist near a water source, it can reproduce and can adapt to its environment.
Life on Earth is thought to have started 3.7 billon years ago. Life elsewhere in the Universe is still yet to be discovered but a great way to consider the varibles is the famous Drake Equation which Pamela did a great show about on Astronomy Cast
