Just five years ago, Uma Valeti, a cardiologist, Nicholas Genovese, an oncologist, and Will Clem, a biomedical engineer, quit their jobs to start Upside Foods in Berkeley. They developed a biological process to grow synthetic meat products by taking stem cells from animals and eggs; feeding those cells nutrients, carbohydrates, minerals, fats, and vitamins; and speeding up their growth in a bioreactor. Using this technique, Upside Foods has been able to produce beef, duck, and chicken at scale.