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Humanity is fast approaching the point of being able to answer the age-old question: Are we alone in the cosmos? The answer will almost certainly turn out to be 'no'. This is virtually guaranteed by two discoveries made in the last hundred years or so: that the Milky Way is just one of countless galaxies; and that the number of planets beyond our solar system - 'exoplanets' - is vast.
But what is extraterrestrial life actually like? What kinds of creatures roam the surfaces of alien planets or swim in their seas? Are they typically in the genre of 'life as we know it', or are they characterized by exotic forms and as-yet undiscovered metabolism? In Parallel Worlds, Wallace Arthur argues that we should expect to find creatures that are similar in broad terms to those of Earth. This can be anticipated because the environments of habitable planets have many parallel features, so Darwinian natural selection should work in parallel ways, producing broadly parallel trees of life.
This book takes the form of a step-by-step argument in favour of the hypothesis that there are multiple worlds inhabited by life-forms that are broadly parallel to those of our home planet. Like all good hypotheses, it's testable. The testing won't be easy, and it isn't imminent; but it will happen eventually, providing humanity lasts for long enough.
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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