"Eat, Drink and Be Merry..." begins with plastic, the plastic credit card, and the concept of credit, then leaps back to the time of the dukes of Burgundy, the first state to use credit. The dukes used credit for many luxuries, and to buy more armour for a stronger army. The Swiss opposed the army of Burgundy and invented a new military formation (with soldiers using pikes) called the pike square. The pike square, along with events following the French Revolution, set in motion the growth in the size of armies and in the use of ill-trained peasant soldiers. Feeding these large armies became a problem for Napoleon, which caused the innovation of bottled food. The bottled food was first put in champagne bottles then in tin cans. Canned food was used for armies and for navies. In one of the bottles, the canned food went bad, and people blamed the spoiled food on "bad air", also known as swamp air. Investigations around "bad air" and malaria led to the innovation of air conditioning and refrigeration. In 1892, Sir James Dewar invented a container that could keep liquids hot or cold (the thermos) which led three men – Tsiolkovsky, Robert Goddard, and Hermann Oberth – to construct a large thermal flask for either liquid hydrogen and oxygen or for solid fuel combustion for use in rocket propulsion, applying the thermal flask principle to keep rocket fuel cold and successfully using it for the V-2 rocket and the Saturn V rocket that put man on the moon.