The massacre of Red Crescent and civil defence aid workers has elicited little coverage and no condemnation by major powers — this is the age of lawlessness, warns JOE GILL
Leonardo and the dialectics of nature
On the 570th anniversary of Leonardo da Vinci’s birth, JENNY FARRELL takes a look at the techniques that made the great Renaissance painter and scientist’s work so significant

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.
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