William Styron was one of the flamboyant literary figures of the 20th Century. He was a Southerner whose novel Lie Down in Darkness received immense acclaim when he was just 26 years old. He would go on to write the Confessions of Nat Turner, for which he received the Pulitzer Prize for fiction in 1968.
But for the last 27 years of his life, Styron did not write a novel. He battled depression, and wrote a seminal work about it, Darkness Visible, in 1990.
Chefs these days stock all sorts of high-tech tools, from liquid nitrogen to $500 blenders. But in kitchens throughout the world, there's one piece of technology that's been the same since the Stone Age: the mortar and pestle.