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Mostly Harmless is a novel by Douglas Adams and the fifth book in the Hitchhiker's Guide to the Galaxy series. It is described on the cover of the first editions as "The fifth book in the increasingly inaccurately named Hitchhikers Trilogy". It was the last Hitchhiker's book written by Adams.

Why is it a mistake to think you can solve any major problems just with potatoes? How the planet Krikkit, hostile to anything that is not Krikkit, comes to be encased in a Slo-time envelope... Why Arthur Dent has such an urgent wish to return the Ashes to Lord's Cricket Ground, and why a can of Greek olive oil …

Last Chance to See is a 1989 BBC radio documentary series and its accompanying book, written and presented by Douglas Adams and Mark Carwardine. In the series, Adams and Carwardine travel to various locations in the hope of encountering species on the brink of extinction. The book was published in 1990. In 2009, the …