Dalial Freitak and Annette Kleiser are the co-founders of Dalan Animal Health, a company that has brought to market the first vaccine for insects. Their problem is this: How do you turn a discovery about insect immune systems into a vaccine that can protect the bees we need to grow everything from almonds to blueberries?

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Sean Hunt is the co-founder and CTO of Solugen, a company that sells around $100 million a year of industrial chemicals. Sean's problem is this: How do you make the chemicals that go into everything around us -- our food, our clothes, our cars -- without using fossil fuels?

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Refrigeration is an underrated technology. It completely transformed what billions of people eat every day.

Today’s guest, Nicola Twilley, tells the story of refrigeration in her new book, Frostbite: How Refrigeration Changed Our Food, Our Planet, and Ourselves. Topics under discussion include: Why brewers were key drivers of refrigeration technology; the extraordinary technology inside a bag of lettuce; and why the technological frontier in food preservation may mean that we don't need to keep so much stuff so cold.

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