How do people freeze-dry food?

Freeze-dried food seems like something that was invented for space travel, but this technique for preserving food is actually more than a hundred years old! Nowadays you might see freeze-dried mangos or strawberries in many grocery stores. You know, the ones that are dry and crispy and light as a feather? But how exactly do you make them? We asked food scientist Dave Dominguez to help us find the answer.

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