Yeast vats: the future of food?

Isaac Asimov and other classic sci-fi writers envisioned a future in which great vats of yeast or bacteria could feed humanity. We're not there yet, but today's startups are using yeast cultures to produce milk, egg whites and even coffee. And if you're not sure about yeast-brewed egg whites, you can always try lab-grown cultures of beef, produced by a company whose other line of work is 'bioprinted leather'.

They've got funding, they've got partnerships, and they've even got some lab-grown food on shelves already.