Bradley Cooper talks about writing, directing and starring in his remake of 'A Star is Born.' He not only had to learn how to direct, he had to learn how to sing and play guitar for his role as musician Jackson Maine opposite Lady Gaga.

Salt, fat, acid, heat – those are the four elements to mastering cooking, according to James Beard-winning cookbook author Samin Nosrat. She's adapted her bestselling cookbook, 'Salt Fat Acid Heat,' into a four-part Netflix docuseries. She spoke with producer Sam Briger.