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• There have been reports of some localised fumarole activity during the past 100 years, and a new lava flow broke out only 20 years ago.

• Whilst the events described in this book took place several decades ago, they remain uncannily contemporary.

• It is interesting to note that the concept of natural selection as the sole force in maintaining polymorphisms went virtually unquestioned 15 years ago.

• This goal seemed virtually unattainable not long ago.

• Since their introduction over 10 years ago, oral contraceptives have gained wide and ever-increasing acceptance as a satisfactory and relatively trouble-free means of fertility control.

• The rotation of political power to an opposition party more than three years ago has not ended the streaks of political corruption.

• A century ago, just reaching it was the ardent dream of many explorers.

• The suggestion that such 'traditional' cultures and identities are fixed and static has lost currency long ago.

• The showman explained that twenty years ago he collected five pounds a week on average, earning seven or eight shillings from each street performance.

• Increased subaerial volcanism and the rise of atmospheric oxygen 2.5 billion years ago.

• We are certainly attacking more and more complex conditions, including those considered hopeless not very long ago.

• The first humans arose about two million years ago.

• Imagine a political scientist who fell asleep twenty-five years ago.

• Some years ago it was difficult to properly evaluate an artistic movement that quite autonomously was in the process of development.

• In evolutionary terms, a century is of no significance - indeed we are genetically almost identical to our ancestors of 10 centuries ago.