A team of US physicists has proved a theorem that explains how our objective, common reality emerges from the subtle and sensitive quantum world... The Los Alamos team define a property of a system as 'objective', if that property is simultaneously evident to many observers who can find out about it without knowing exactly what they are looking for and without agreeing in advance how they'll look for it." The full article "Natural selection acts on the quantum world" is fascinating (and accessible to non-scientists). http://www.nature.com/news/2004/041220/full/041220-12.html