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If there really is alien life elsewhere in the Universe, then it's reasonable to ask why we haven't seen it. Surely planet Earth would have been visited by aliens? Does that mean that alien life doesn't exist? This book uses some simple maths to take a sober look at the chances of our actually meeting alien life. After all, we will only meet up if both of us are in the right place at the right time. The Universe is a big place - and it has been around for a long time. Perhaps we were "out" when they visited us? Why Haven't We Seen Aliens is part of the Cold Fusion series, published by Ransom Publishing, a specialist children's publisher. The series is designed for more able readers, gifted and talented children, and those who are curious, enjoy a challenge and like thinking outside the box. Why Haven't We Seen Aliens is ideal for more able readers aged 9 - 12 with a reading age of 12 + .