A mathematical exercise in keeping things cool
@exercise 3: Unless I'm very much mistaken, these boxes are meant for transportation, not storage. So duration of cooling is a *constraint*, not a *goal* in their design. They just need to keep the content cold until it can be transferred to actively cooled storage or used, not as long as possible.
Thus, you use just enough insulation to satisfy the constraint and optimize for other goals, like material cost and space efficiency.
This is what Substack needs! Really good.