`One of the most important documents of the twentieth century.' - Sir Peter Medawar, New Scientist
`One cannot help feeling that, if it had been translated as soon as it had been originally published, philosophy in this country might have been saved some detours. Professor Popper's thesis has that quality of greatness that, once seen, it appears simple and almost obvious' - Times Literary Supplement
'One of the most important documents of the twentieth century.' – Peter Medawar, New Scientist