A few months ago, I helped a friend prepare a shipment of food products for a long trip. Everything looked fine when it left the warehouse, but we started worrying about what could happen to the products while they were on the road. That experience got me interested in cold chain logistics solutions and how businesses keep temperature sensitive goods safe from storage through final delivery. I'd like to hear from others who have dealt with this. What part of managing a cold chain was the hardest for you?