The ancient Greek civilisation flourished for about a thousand years, not as a unified country but rather as a loose association of city states, both on the mainland of Greece and elsewhere around the Mediterranean. The philosopher Plato described the states as being like a series of frogs sitting around a pond. Although the Greeks drew on the ideas of various earlier civilisations, they were the people who, more than any other, handed down to us the foundations of our democracy, our notions of ethics and justice, our science, our mathematics and our music. But perhaps their most amazing invention is the first known computer. This was a small box stuffed with cogs and moving parts all skilfully made and by turning a handle it would display the movements of planets to an astonishing degree of accuracy -in fact it was a planetarium. Hermione Cockburn gets the Adam 'finger towards the horizon' treatment this week.