The question is not simply how much we spend on defence, but what we understand defence and security to mean, says SIMON BRIGNELL
LEONARDO DA VINCI was born 570 years ago, on April 15 1452 near the village of Vinci, from which he takes his name.
His mother Caterina was a servant, his father, a professional notary, with whom he was living by 1457 and later with his paternal grandfather. It was during the seven years with his grandfather that Leonardo learned to read, write and calculate.
He never learned Latin, Greek or higher mathematics. Instead, he took up an apprenticeship and ended up in the workshop of a master painter in Florence, which in the 15th century, like much of Italy, was a violent place, where rival merchant dynasties fought each other for power.
SIMON DUFF is thrilled by a visceral, no-holds-barred exploration of the expressive powers of raw material
Nature as well as society works dialectically, asserts the Marx Memorial Library and Workers’ School
Neutrinos are so abundant that 400 trillion pass through your body every second. ROX MIDDLETON, LIAM SHAW and MIRIAM GAUNTLETT explain how scientists are seeking to know more about them
MIKE COWLEY welcomes half a century of remarkable work, that begins before the Greens and invites a connection to — and not a division from — nature



