Life On Mars
Named after the Roman god of war, Mars has been a source of continual fascination. It is one of our nearest neighbours in space, though it takes about a year to get there. It is very inhospitable with high winds racing across extremely cold deserts. But it is spectacular, with the highest volcano in the solar system and a giant chasm that dwarfs the Grand Canyon.
For centuries there has been fierce debate about whether there is life on Mars and from the 19th century it was even thought there might be a system of canals on the planet. This insatiable curiosity has been fuelled by writers like HG Wells and CS Lewis and countless sci-fi films about little green men.
So what do we know about Mars – its conditions, now and in the past? What is the evidence that there might be water and thus life on Mars? And when might we expect man to walk on its surface?

Pros and Cons offers a unique and invaluable guide to current controversies, providing material for debate on a wide range of topics. Arguments for and against each subject appear in adjacent columns for easy comparison and related topics and suggestions for motions are listed at the end of each entry. Since its first publication in 1896 the handbook has been regularly updated and this 18th edition includes new issues such as censorship of the internet, genetic engineering and legalisation of prostitution. The introductory essay describes debating technique: covering the rules, structure and types of debate and offering tips on how to become a successful speaker.

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