Next week

American idols
As the US presidential candidates polish their lines, Paul Krugman gives his view on American power

Also
Admissions uncovered: testing times as universities set their own entrance exams

David Hughes on Brian Greene's The Fabric of the Cosmos

Simon Blackburn reviews a distinctive take on Darwinism

COMING SOON...
Will it be gold or gloom for the sport scientists supporting Britain's bid for swimming glory?