Billions of packages each year of perishable, temperature-sensitive products wind their way through North America’s supply chain and confront every customer with a nagging question:  Has it been affected by freezing temperatures in transportation or storage? Temperatures below 32°F (0°C) can impact products as diverse as fruits, vegetables, fresh fish and meat, flowers, agricultural products, ink, chemicals, solvents, paint, medical samples, vaccines, food home delivery and certain types of m...